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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单项选择题
She looks like her mother,（）.

A. doesn’t she
B. isn’t she
C. hasn’t she
D. won’t she
单项选择题
By the time you get to New York, I （） for London.

A. would be leaving
B. am leaving
C. have already left
D. shall have left
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