题目内容

You should make it a rule to leave things______ you can find them again.

A. where
B. when
C. in which
D. that

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It was quiet______ those big trucks started coming though the town.

A. before
B. after
C. until
D. unless

Hardly had he reached the school gate______ the bell rang.

A. while
B. when
C. as
D. as soon as

I recognized you______ I saw you at the airport.

A. the moment
B. while
C. after
D. once

He was about to go to bed______ the doorbell rang:

A. while
B. as
C. before
D. when

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