单项选择题

So many representatives______, the conference had to be put off.

A. were absent
B. to be absent
C. being absent
D. had been absent
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单项选择题
-How did you pay the workers -As a rule, they were paid by______.
A. the hour
B. an hour
C. hour
D. the time
单项选择题
In no case______the students from exploring new ideas.
A. we should prevent
B. we could prevent
C. should we prevent
D. shouldn't prevent
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