单项选择题

Writing books ______ a very difficult task.

A．was
B．were
C．is
D．are
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单项选择题
The doctor said this medicine is ______ against lung cancer.
A．efficient
B．effective
C．expensive
D．effort
单项选择题
You'd better ______ your homework by the time I arrived.
A．finished
B．finish
C．had finished
D．finishing
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