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lose weight _______________ you change your eating habits. A.unlessC.since【答案】 B 【解析】【分析】句意:除非你改變你的飲食習(xí)慣,否則你不能減肥。除非改變飲食習(xí)慣,否則不會減肥,所以用unless,故選B。24.My boss is waiting for the report, so I can39。sinceB.though【答案】 B 【解析】【分析】句意:我的老板正等著匯報,因此我直到完成匯報才能離開這兒。not…until,直到……才,故選B。25.—When did you know there would be an important meeting? —_______ Sandy called me this morning.A.B.C.D.since自從,與完成時連用;till直到,not until直到……才;while當(dāng)……時候,與進(jìn)行時連用。 【點評】考查狀語從句。26.A ship is safe if it stays in a harbor. But this is not ________ it is built for. A.B.C.D.for介詞后面跟代詞作賓語。 【點評】考查連詞辨析。27.— Excuse me. I wonder ______________ the plane can land on time. — Wait a minute, please. Let me check it out.A.whichC.——請等一下。A是否,引導(dǎo)賓語從句,物成分,B哪一個,引導(dǎo)賓語從句做定語,C引導(dǎo)賓語從句,物成分,無詞意,根據(jù)從句中不缺少成分,故主句的謂語動詞wonder,可知是if , 故選A。28.— What were you and your father doing at 7:00 yesterday evening? — I was doing my homework _______________ my father was reading newspapers.A.as soon asC.此處表示“讀書”和“做作業(yè)”兩個動作同時發(fā)生,故排除B,when引導(dǎo)時間狀語從句,主句用過去進(jìn)行時,從句常用一般過去時,而while當(dāng)……時候,引導(dǎo)時間狀語從句時,謂語動詞為持續(xù)性動詞,且常和進(jìn)行時連用,故選C。注意識記while的詞義和用法。becausesinceasbecause of【答案】 D 【解析】【分析】句意:那位作家因為腿不好走得慢。his bad leg不是句子,所以用because of。30.Your dream will e true ______________ you put your heart and soul into it. A.unlessC.until【答案】 A 【解析】【分析】句意:如果你全心全意,那么你的夢想將會實現(xiàn)。分析句子可知,這是一個主從復(fù)合句,挖空后引導(dǎo)一個條件狀語從句,引導(dǎo)詞應(yīng)用if,如果,故選A。注意if,unless,although和until的詞義和用法