You ______ wash your hands before meals. It is good for your health.
A. may  B. can  C. must
C

試題分析:A. may表推測,可能 B. can 能夠    C. must必須,肯定推測,根據(jù)句意:你必須飯前洗手,這對你的健康又好處,be good for對……有好處;故選C.
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