【題目】You _______ wash your hands before meals. It is good for your health.
A.can
B.have to
C.must

【答案】C
【解析】句意：你……在吃飯前洗手。這對你的健康有好處。根據(jù)句意可知你必須在吃飯前洗手，故選C。

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