【題目】No one was allowed to leave the lab without the professor's p.
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【題目】It is nearly 50 years ______ the People’s Republic of China was founded.
A. after B. before
C. when D. since
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【題目】You won’t find it difficult ______ you have mastered it.
A. before B. while
C. once D. though
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【題目】It was so dark in the theatre that I could hardly ________ my friend.
A. pick up B. bring out
C. call out D. pick out
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【題目】After he left college, he was employed in an international company and there ever since .
A. worked B. had worked
C. has worked D. was working
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【題目】The meaning of the word "nice' changed a few tines it finally came to include the sense "pleasant."
A. before B. after
C. since D. while
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【題目】John, ________ money was now no problem, started a new company with his friends.
A. for whose B. of whose C. of whom D. for whom
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【題目】These diagrams are especially helpful when we have a concrete problem ______ at hand.
A. be solved B. to solve C. solved D. being solved
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