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题型：单选题题类：模拟题难易度：普通

Students can't be made ______ all day.

A、study B、studying C、to study D、studied

举一反三

I am getting ready 　　　 a birthday cake for Lingling.

There's too much fog today so they decide .

It's necessary for us ________ to our parents when we have problems.

Cindy's grandmother is learning _______________ the new mobile phone.

We must do everything we can waste water from running into rivers.

—Peter always remembers ____ the light off when he leaves the room.

— That's great. It's a good way to save energy.

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