单项选择题

The old lady ______ and fell from the top of the stairs to the bottom.

A．slided
B．slipped
C．split
D．spilled
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单项选择题
I ______ him the Christmas gift by mail because he came home during the Christmas holidays.
A．ought to have sent
B．couldn’t have sent
C．must have sent
D．needn’t have sent
单项选择题
If the scheme is ______ carried out without waste of time or energy I shall be completely satisfied.
A．relatively
B．noticeably
C．appropriately
D．efficiently
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