单项选择题

Neither of my parents ______ in this company.

A． works
B． are working
C． work
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单项选择题
The boss kept the visitor ______ in the waiting room for him.
A． wait
B． to wait
C． waiting
单项选择题
I don't know ______.
A． who is he
B． who he is
C． he is who
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