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C.whatD.which【答案】 C 【解析】【分析】句意:他們?cè)谏掷锩月妨?,更糟糕的是天開始黑了。根據(jù)連詞and可知,本句需要一個(gè)引導(dǎo)主語從句的連接詞,該詞同時(shí)還要能在從句里充當(dāng)主語。that不能在句中作成分;it不能引導(dǎo)主語從句;which意為“哪一個(gè)”,不符合本句語境。排除A、B、D三項(xiàng)。故選C?!军c(diǎn)評(píng)】考查名詞性從句,本題涉及what引導(dǎo)的主語從句的應(yīng)用。13.Exactly _________ the potato was introduced into Europe is uncertain, but it was probably around 1565. A.whetherB.whenC.whyD.how【答案】 B 【解析】【分析】句意:土豆被引進(jìn)歐洲具體的事件不被確定,但是可能是在1565年左右。根據(jù)時(shí)間狀語round 1565得知這里是指時(shí)間不確定。故選B。 【點(diǎn)評(píng)】考查名詞性從句,本題涉及when引導(dǎo)的主語從句。 14.It has been pointed out ________ plays a vital role in driving away one39。s anxiety is one39。s sweet childhood memories. A.what thatB.whichC.thatD.that what【答案】 D 【解析】【分析】句意:有人指出,驅(qū)除焦慮所起著至關(guān)重要的作用是童年美好的回憶。本句時(shí)一個(gè)主語從句,it作形式主語,真正的主語為that what plays a vital role in driving away one39。s anxiety is one39。s sweet childhood memories.,主語從句中又有一個(gè)主語從句,且此主語從句中缺少主語,所以用what引導(dǎo)。故選D。 【點(diǎn)評(píng)】考查名詞性從句,本題涉及what引導(dǎo)的主語從句。15.________ manners are very important in every country is known to all,but the trouble is that different countries have different ideas about ________ good manners are. A.That。 whatB.That。 thatC.What。 thatD.What。 what【答案】 A 【解析】【分析】句意:眾說周知,禮貌在每一個(gè)國家中都是非常重要的,但是麻煩是,不同的國家對(duì)于什么是良好的禮貌有著不同的認(rèn)識(shí)。逗號(hào)前有兩個(gè)謂語動(dòng)詞,一個(gè)是are,一個(gè)是is known,故是兩句話,需填連詞連接這兩句話,根據(jù)句意可知,前面是主語從句,故填that,此處的that,只起連接作用不作任何成分。about是介詞,其后是個(gè)句子故應(yīng)填連詞把這兩句話連接起來,所缺詞作are的表語,故填what。因此選A。 【點(diǎn)評(píng)】考查名詞性從句,本題涉及that引導(dǎo)的主語從句和what引導(dǎo)的賓語從句。16._______ has not been decided next. A.How to doB.What to do nextC.To do whatD.To do how【答案】 B 【解析】【分析】句意:接下來做什么還沒有決定。根據(jù)助動(dòng)詞has可知前面是主語,what to do為名詞性從句,可做主語,故選B。 【點(diǎn)評(píng)】考查名詞性從句,識(shí)記名詞性從句做主語的用法。17.________ is the centre of our planetary system was a difficult concept to grasp in the Middle Ages. A.It39。s the sun and not the earthB.The sun and not the earthC.Being the sun and not the earthD.That the sun and not the earth【答案】 D 【解析】【分析】句意:太陽而不是地球是我們行星系統(tǒng)的中心,這在中世紀(jì)是一個(gè)很難理解的概念。分析句子可知,整個(gè)句子為主系表結(jié)構(gòu),was為系動(dòng)詞,它之前的都為主語,且主語由句子來充當(dāng),句子結(jié)構(gòu)以及句意完整,所以連詞代詞為that。故選D。 【點(diǎn)評(píng)】考查名詞性從句,本題涉及that引導(dǎo)的主語從句。18.He took a trip to Beijing last week and ________ he saw at the Forbidden City impressed him deeply. A.thatB.howC.what16