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18.Your hands ______ before meals.They are too dirty.(  )
A.must washB.can washC.must be washedD.can be washed

分析 你的手必须在饭前洗,因为它们太脏了.

解答 答案:C.考查情态动词及被动语态.句意"你的手必须在饭前洗,因为它们太脏了.".主语hands"手"是动词wash"洗"动作的承受者,因此用被动语态,因此A,B不正确.情态动词的被动语态结构是情态动词+be动词+动词的过去分词.must必须,语气比较强烈.can可以.结合语境"手必须饭前洗",应该用must be washed,D不正确.答案是C.

点评 考查情态动词.情态动词在句中不受人称,性别,单复数变化的影响,但是要考虑时态,交际用法等.情态动词的被动语态结构是"情态动词+be+动词的过去分词".结合语境,选择情态动词的适当用法.

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