问题
选择题
You ______ wash your hands before meals. It is good for your health.
A. may B. can C. must
答案
答案：C
题目分析：A. may表推测，可能 B. can 能够 C. must必须，肯定推测，根据句意：你必须饭前洗手，这对你的健康又好处，be good for对……有好处；故选C.
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