单项选择题

That sentence was hard to understand, so I had to have my teacher ______ it for me.

A. to explain



B. explain
C. explaining



D. to be explaining
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单项选择题
I don’t allow ______ in my class, nor do I allow my family ______ at home.
A. to smoke...smoking

B. smoking...to smoke
C. to smoke...to smoke

D. smoking...smoking
单项选择题
It’s unwise ______ down the proposal.
A. for them to turn


B. for their turning
C. of them to turn


D. for they to turn
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