单项选择题

I have no idea what Mary ______ at this time tomorrow.

A．will be doing
B．is doing
C．will do
D．does
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单项选择题
All the class burst ______ laughter when they saw the funny picture.
A．in
B．at
C．on
D．into
单项选择题
He ought to have handed in the paper yesterday. That's what he ______ .
A．should do
B．should
C．should be doing
D．should have done
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