单项选择题

It was two years ago______his sister became a doctor．

A．that
B．where
C．who
D．what
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单项选择题
Please give us the reason______the goods were delayed．
A．why
B．which
C．what
D．how
单项选择题
I feel it's a great honor for me______to this party．
A．to invite
B．invite
C．having invited
D．to be invited
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