单项选择题

The office staff ______ gathered to hear the president speak.

A. are
B. is
C. has
D. will have
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单项选择题
______, he would not have recovered so quickly.
A. Hadn't he been taken good care of
B. Had he not been taken good care of
C. Had not he been taken good care of
D. Had he been not taken good care of
单项选择题
The instruction asks that we ______ a red pen.
A. do not use
B. not use
C. use not
D. did not use
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