单项选择题

I greatly appreciate（）the opportunity to study abroad two years ago.

A．giving
B．have been given
C．give
D．having been given

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单项选择题
Kate wondered what the result was, but I refused to tell her until she（）the novel.

A．finishes
B．have finished
C．had finished
D．finished
单项选择题
Not until several months later（）I realize how foolish I had been then.

A．have
B．had
C．did
D．do
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