Doctors are doing _____ to find out what will happen when people stop smoking.

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1. Doctors are doing _____ to find out what will happen when people stop smoking.

A . exercise B . housework C . research D . training

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英语人教新目标(Go for it)版八年级下册Unit 7 What's the highest mountain in the world Section B 课后作业练习题（二）
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