单项选择题

______you don't know the rule won't be a sufficient excuse for your failure.

A. It is
B. That
C. Because
D. What
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单项选择题
His wife had the front door painted yesterday, ______she
A. did
B. didn't
C. had
D. hadn't
单项选择题
The president spoke at the business meeting for nearly an hour without______his notes.
A. bringing up
B. referring to
C. looking for
D. trying on
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