【题目】First we must _______ the water. ( )
A.boilB.boilingC.boils
【答案】A
【解析】
句意：首先我们必须把水烧开。情态动词must+动词原形，A. boil动词原形，B. boiling动词ing，C. boils动词三单，故选A。
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