单项选择题

I've got a very ______ schedule today so I can't see you until tomorrow.

A．serious
B．big
C．tough
D．tight
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单项选择题
The rough draft of any research report should be edited to ______ that all data are correctly presented, that all equipments are listed, that all results are properly de-tailed.
A．ensure
B．assure
C．secure
D．insure
单项选择题
If you ______ that night, you might have been too late to get your ticket.
A．didn't hurry
B．hadn't hurried
C．wouldn't hurry
D．hadn't to hurry
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