单项选择题

Mary ______ a diary.

A．carries on
B．follows
C．puts down
D．keeps
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单项选择题
As soon as children were ______ their mother got them out of bed and into the bathroom.
A．woke
B．awoke
C．awake
D．waken
单项选择题
They ______ us since five o'clock this morning until now.
A．are helping
B．help
C．have helped
D．have been helping
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