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
Everyone thinks the skirt ______ you well.
A. suitable
B. reasonable
C. probable
D. fits
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