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科目: 來源:不詳 題型:單選題

Qian Xuesen tried many times _________ he found the solution to the puzzle about space technology.
A.a(chǎn)fterB.beforeC.sinceD.when

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科目: 來源:不詳 題型:單選題

Physical Education in schools can teach us endurance — something we all need ______ life becomes tough.
A.unlessB.in caseC.thoughD.until

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科目: 來源:不詳 題型:單選題

He thought she was a pretty girl     poorly she was dressed.
A.howB.a(chǎn)s thoughC.a(chǎn)s long asD.however

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科目: 來源:不詳 題型:單選題

We were about to go out for a walk ______ it began to rain.
A.whileB.beforeC.a(chǎn)sD.when

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科目: 來源:不詳 題型:單選題

_______ excited his parents most is that he had passed the entrance exam and was admitted into his dream college.
A.ThatB.WhatC.WhichD.It

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科目: 來源:不詳 題型:單選題

Be quick, _____ we’ll miss the beginning of the fireworks display in the park.
A.soB.orC.becauseD.though

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科目: 來源:不詳 題型:單選題

Many people can't learn any lessons from the mistakes they've made _____ they get hurt somehow.
A.whetherB.unlessC.ifD.a(chǎn)s

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科目: 來源:不詳 題型:單選題

Martin drove along ______ he found a convenient parking place.
A.a(chǎn)fterB.whenC.untilD.since

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科目: 來源:不詳 題型:單選題

--What are you going to do this weekend?
--I will go to visit my grandparents _____ I have time.
A. as far as     B. as much as      C. as long as     D as many as

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