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
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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
单项选择题
We must find a way to cut prices ______ reducing our profits too much.
A. without
B. despite
C. with
D. for
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