单项选择题

He ______ with Smith at least four times in the past three years.

A. has been seen to meet

B. was seen to meet
C. had been seen meeting

D. is seen meeting
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单项选择题
I don’t think it advisable that Tom ______ to the job since he is too young.
A. is assigned


B. be assigned
C. will be assigned


D. has been assigned
单项选择题
Americans eat ______ as they actually need every day.
A. twice as much protein

B. twice protein as much
C. twice protein much

D. protein twice much
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