单项选择题

By the end of the year all but two people ______

A. have left


B. will leave
C. will be leaving


D. will have left
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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
单项选择题
Some people are sitting on the grass; others are strolling along the lake side,______.
A. chatting and to laugh

B. to chat and to laugh
C. chatting and laughing

D. chatting and laughed
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