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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单项选择题
Annie's glass, I apologized to her.
A) To break
B) Breaking
C) Having broken
D) Break
单项选择题
The ship took machines and other goods back to the port ______ it had set off.
A) from which
B) to which
C) which
D) in which
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