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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．afterB．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．as thoughC．as 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．asD．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．as

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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．afterB．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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