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