单项选择题

There is no doubt ____ he is a good employee．

A．as
B．who
C．that
D．whats
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单项选择题
It was two years ago _____ his sister became a doctor．
A．that
B．where
C．who
D．what
单项选择题
I am sorry，but I have a question to ____ you．
A．treat
B．influence
C．ask
D．change
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