He must be helping the old man to water the flowers，________？
A．is heB．isn't he
C．must beD．mustn't he
B
must在此表猜測，是“一定”之意，此時(shí)反意疑問句部分以must之后的動(dòng)詞為準(zhǔn)，所以B項(xiàng)正確。
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