问题

The mail was _____ for two days because of the snow storm.
A: held out
B: held off
C: held up
D: held down
B: held off
C: held up
D: held down
正确答案是:
同类题型
Not until he failed in the last examination _________he should have spent more time on study
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I spent the whole day repairing the car The work was _____ easy [ ]