Jack must be helping his grandma to water the flowers,______?
A．is heB．isn’t he C．must heD．mustn’t he
B
考查反義疑問句。Must表推測時，反義疑問句要根據(jù)句子的實際意義進行反問，而不是根據(jù)前面出現(xiàn)的情態(tài)動詞，句意：杰克肯定在幫助他的奶奶澆花，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。所以選B。
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