单项选择题

—Has Torn finished his homework
—I have no idea; he______it this morning.

A．was doing
B．had been doing
C．had done
D．did
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单项选择题
What a great weight mother felt______ her mind the moment she found her lost son.
A．turned off
B．taken off
C．set off
D．broken off
单项选择题
—What about having a drink —______.
A．Good idea
B．Help yourself
C．Go ahead, please
D．Me, too
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