单项选择题

We could not have fulfilled the task in time if it ______ for their help.

A. was not
B. is not
C. had not been D. has not been
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单项选择题
The first textbook ______ for teaching English as a foreign language came out in the 16th century.
A. writing
B. written
C. to write
D. to be written
单项选择题
Ever since I arrived here, I ______ in the dormitory because it is cheaper.
A. lived
B. was living
C. had been living
D. have been living
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