单项选择题

The temperature ______ below zero last night because the water is frozen all over.

A．had dropped
B．must have dropped
C．would have dropped
D．must drop
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单项选择题
______ his failure in the exam, Randy said he had been ill.
A．By excuse of
B．With excuse of
C．In excuse of
D．For excuse of
单项选择题
Sue took on the extra work ______.
A．on her dignity
B．in her good graces
C．with a dignity
D．with a good grace
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