He must be helping the old man to water the flowers, ? A. is he B. isn’t he C. must he D. mustn’t he [答案]B 考查反意疑問句.陳述句中的謂語中雖有情態動詞must.但此處must表示對正在進行的動作進行推測.將其不看作情態動詞.而must后有助動詞be.故反意疑問句根據助動詞be來構成.選B. 【查看更多】
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(09陜西卷)16. He must be helping the old man to water the flowers, ?
