单项选择题

In the southwestern part of the United States ______ built in the last century.

A. there are many abandoned mining towns
B. were many abandoned mining towns
C. where there are many abandoned mining towns
D. where are many abandoned mining towns

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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