题目内容

I will be back tomorrow______there is a plane strike.

A. but
B. and
C. unless
D. if not

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A. 3
B. 6
C. 8
D. 12

______he starts a job, he won't stop until it is finished.

A. Once
B. After
C. Until
D. As soon as

A body,______it is in motion, would never stop itself if there were no friction.

A. till
B. when
C. before
D. once

The journey there was terrible, but______we'd arrived we had a wonderful time.

A. until
B. when
C. once
D. as