单项选择题

The engineer claims that this engine is ______ as the previous one.

A．twice powerful
B．as twice powerful
C．powerful as twice
D．twice as powerful
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单项选择题
It was not until the accident happened ______.
A．that I realized my carelessness
B．when I realized my carelessness
C．as I realized my carelessness
D．when my carelessness has been realized
单项选择题
I could have called you yesterday, but I ______ your telephone number.
A．didn't have
B．hadn't had
C．won't have
D．wouldn't have
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