单项选择题


A．All right. Is that better
B．No, I can’t.
C．It doesn’t matter.
D．I’d rather you do it.
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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
It's high time we ______ something to stop road accidents.
A．did
B．are doing
C．will do
D．do
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