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for it?A.while B.until C.a(chǎn)fter D.unless【答案】D【解析】【詳解】句意:除非我們每個(gè)人都做一些有益的事情,否則我們?nèi)绾尾拍艽蟠蟾纳莆覀兊沫h(huán)境呢?考查連詞辨析。t enjoy good health ______ we often exercise.A.though B.if C.when D.unless【答案】D【解析】【詳解】句意:我們都知道如果我們不經(jīng)常鍛煉,我們將不會(huì)享有好的健康。只有D項(xiàng)符合題意。三、如果主句是含有情態(tài)動(dòng)詞的一般現(xiàn)在時(shí),根據(jù)需要從句多用一般現(xiàn)在時(shí) 如:You should be quiet when you are in the reading room 在閱覽室時(shí)應(yīng)保持安靜 四. 如果if的條件狀語從句遇到變換間接和直接時(shí) , 祈使句應(yīng)用not to.... 如。根據(jù)句意可知,空后all of us could understand her表示前面explained…clearly的目的,故用so that引導(dǎo)目的狀語從句,選C。;……之后;;。A. until用于肯定句中,表示主句的動(dòng)作一直持續(xù)到從句動(dòng)作發(fā)生或狀態(tài)出現(xiàn)時(shí)為止。當(dāng)主句描述將來動(dòng)作時(shí),英語條件狀語從句中用一般現(xiàn)在時(shí)態(tài)表示將來的動(dòng)作;主語單三,謂語動(dòng)詞用單數(shù)形式;故選A。18. ______ Mike didn’t win the race , he was still wearing a smile on his face.A.If B.Since C.Although D.Because【答案】C【解析】【詳解】句意:雖然邁克沒有贏了比賽,但是他臉上仍然帶著笑容。但是只要我們合理使用他們,他們就對我們有幫助”。A.unless如果不,除非;引導(dǎo)條件狀語從句;B.once一旦……,引導(dǎo)條件狀語從句;C.when當(dāng)……時(shí),表示兩個(gè)動(dòng)作同時(shí)發(fā)生,主句一般使用過去時(shí),從句使用過去進(jìn)行時(shí);D.while當(dāng)……時(shí),表示兩個(gè)動(dòng)作同時(shí)發(fā)生,后跟延續(xù)性動(dòng)詞,從句一般使用進(jìn)行時(shí)態(tài),表示一段時(shí)間。so所以;because因?yàn)?;before在……之前;if如果??疾檫B詞辨析。23.Some children prefer to eat sweet chocolate _____ it’s not good for their health.A.because B.if C.when D.though【答案】D【解析】【詳解】句意:有些孩子喜歡吃甜巧克力,雖然這對他們的健康不好。24.—His handwriting is very careful.—Yeah. With the help of him, his sister writes as ________ as him.A.care B.carefulC.more carefully D.carefully【答案】D【解析】試題分析:句意:——他的書寫非常認(rèn)真。as+形容詞的原級+as“和……一樣”,修飾動(dòng)詞write,故用副詞carefully,故選D。26. ______ Mike didn’t win the race , he was still wearing a smile on his face.A.If B.Since C.Although D.Because【答案】C【解析】【詳解】句意:雖然邁克沒有贏了比賽,但是他臉上仍然帶著笑容。so that“為的是,以便”,表示目的;unless“除非”;if“如果”;until“直到”。故選C。30.______we cannot change yesterday,we can learn lessons to face tomorrow.A.Though B.As C.Since D.Unless【答案】A【解析】句意:盡管我們無法改變昨天,但是我們可以吸取教訓(xùn)來面對明天。