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题型：单选题题类：常考题难易度：容易

——What should I do, doctor?
—— _______ healthy, you should take more exercise.

A、Keep B、To keep C、Keeping D、Kept

举一反三

The teacher asked Ben a difficult question in class．

Please remember off(关掉) the lights before leaving.

To _______ something means to produce something new.

—Mr. Wang, I have trouble the text.

—Remember it three times at least.

____ is difficult for him _______ English.

Wang Fang often reads English novels ______ her reading skills.

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