单项选择题

（）, such damages are usually due to carelessness in operation.

A．At large
B．By far
C．In common
D．In general

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单项选择题
The secretary worked late into the night,（）a long speech for the president.

A．to prepare
B．preparing
C．prepared
D．was preparing
单项选择题
Not until I began to work（）how much time I had wasted.

A．didn't I realize
B．did I realize
C．I didn't realize
D．I realize
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