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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He told me that I ______ be present at the ceremony.
A．could
B．would
C．should
D．might
单项选择题
How many computers will the company ______ this year
A．turn up
B．turn out
C．turn on
D．turn over
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