单项选择题

He didn't know ______ is more difficult between maths and physics.

A． which
B． that
C． where
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单项选择题
The suitcase looks too heavy for the lady to carry. Let's go to help her, ______
A． do we
B． shall we
C． will you
单项选择题
The teacher made us ______ the words three times.
A． say
B． to say
C． Saying
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