单项选择题

There has been a great increase in retail sales, （）

A. does there
B. isn’t there
C. hasn’t there
D. isn’t it

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单项选择题
Many a writer of newspaper articles （） to writing novels.

A. has turned
B. have turned
C. have been turned
D. has been turned
单项选择题
Great as Newton was, many of his ideas （） today and are being modified by the work of scientists of our time.

A. are to challenge
B. may be challenged
C. have been challenged
D. are challenging
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