题目内容


Jack must be helping his grandma to water the flowers,______?
A．is heB．isn’t he C．must heD．mustn’t he
B
考查反义疑问句。Must表推测时，反义疑问句要根据句子的实际意义进行反问，而不是根据前面出现的情态动词，句意：杰克肯定在帮助他的奶奶浇花，是不是？所以排除C,D；且前面句子是肯定，所以后面要用否定形式。所以选B。
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