单项选择题

I've never seen the young man ______ next to the director.

A) sits
B) sitting
C) sat
D) to sit
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单项选择题
______, he can quickly find out what's wrong with the machine.
A) Having been well trained
B) Having well trained
C) To be well trained
D) To have been well trained
单项选择题
Annie's glass, I apologized to her.
A) To break
B) Breaking
C) Having broken
D) Break
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