单项选择题

John seldom went to the laboratory, ______

A. didn’t he
B. did he
C. does he
D. doesn’t he
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单项选择题
The prime minister and foreign minister ______ now in China for a 3-day visit.
A. is
B. are
C. to be
D. being
单项选择题
We all took ______ for that he would agree with us.
A. it
B. him
C. that
D. what
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