单项选择题

There is no doubt______he is a aood employee．

A．as
B．who
C．that
D．what
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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
Please give us the reason______the goods were delayed．
A．why
B．which
C．what
D．how
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