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

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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
单项选择题
He said he（）me a present unless I（）in doing the experiment.

A．had not given; had not succeeded
B．would not give; succeeded
C．will not give; succeed
D．would not give; will succeed
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