单项选择题

We have been on duty for four hours and （）

A. now comes your turn
B. now does your turn come
C. now your turn comes
D. comes now your turn

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单项选择题
Only since they gave up that good chance （）to show their invention again.

A. have they had no chance
B. they have had no chance
C. they have no chance
D. have they no chance
单项选择题
Was it five o’clock （）the fire broke out

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