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
If you had taken my advice, you （） in the examination.

A．would have failed
B．wouldn't have failed
C．would fail
D．wouldn't fail
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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