单项选择题

She could do her homework herself (她自己), so she ______ any help.

A．need not
B．not needed
C．didn't need
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单项选择题
If it snows tomorrow, we ______ play with a snowman.
A．will be able to
B．can be able to
C．can able to
单项选择题
These machines must ______ before they are used.
A．check
B．be checked
C．are checked
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