单项选择题

If Newton lived today, he would be surprise by what () in science and technology.

A. had discovered
B. had been discovered
C. has discovered
D. has been discovered

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单项选择题
Ellis Haizlip began his stage career in Washington D. C. , ______ supervised the Howard University Players during their summer season.
A. he was



B. where he was
C. which he



D. where he
单项选择题
Listen! His family must be quarrelling, ().

A. mustn't it
B. isn't it
C. aren't they
D. needn't they
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