单项选择题

By the time you get there tomorrow, they ______ for Beijing.

A) will have left
B) are leaving
C) will leave
D) are to leave

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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

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

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