题目内容

_____ you know the answer, you’ll find it fairly easy.

A. Unless
B. While
C. Once
D. Though

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We had no sooner arrived at the airport _____ it was time to check in.

A. than
B. when
C. then
D. before

We must try our best to get good marks _____ we may win the first prize.

A. as
B. therefore
C. if
D. in order that

It is a long time _____.

A. since I last saw you
B. ago I last saw you
C. when I last saw you
D. then I last saw you

_____ you won't be able to come, we have to put off the meeting.

A. Though
B. As soon as
C. Seeing that
D. Until