单项选择题

-- Can you go shopping with us this afternoon
-- Sorry, I can't. I （）take care of my little sister because she is ill.

A．have to
B．may
C．would

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单项选择题
Today, the forests have almost gone. People must ______ down too many trees.
A．stop from cutting
B．be stopped to cut
C．be stopped from cutting
单项选择题
My mother asked me ______ her with the cooking.
A．helps
B．to help
C．helping
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