单项选择题

______ receiving financial support from family, community or the government is allowed, it is never admired.

A. As
B. Once

C. Although
D. Lest

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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

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

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