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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单项选择题
Whether that is a good solution depends on.
A．how you look at it
B．what you look at it
C．you look at it
D．that you look at it
单项选择题
All the class burst ______ laughter when they saw the funny picture.
A．in
B．at
C．on
D．into
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