单项选择题

All flights ______ because of the snowstorm, many passengers could do nothing but take the train.

A. had been cancelled

B. have been cancelled
C. were cancelled


D. having been cancelled
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单项选择题
In no circumstances can more work be got out of a machine than ______.
A. be put into it


B. is put into it
C. to put into it


D. that is to be put into it
单项选择题
A new technique ______, the yields as a whole increased by 20 percent.
A. working out


B. having worked
C. having been worked out

D. to have been worked out
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