单项选择题

He forgot ______ the bottle first before ______ the medicine.

A． to shake; taking
B． shaking; to take
C． to shake; to take
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单项选择题
He didn't know ______ is more difficult between maths and physics.
A． which
B． that
C． where
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
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