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

B

考查反意疑問句。陳述句中的謂語中雖有情態(tài)動(dòng)詞must，但此處must表示對(duì)正在進(jìn)行的動(dòng)作進(jìn)行推測(cè)，將其不看作情態(tài)動(dòng)詞。而must后有助動(dòng)詞be，故反意疑問句根據(jù)助動(dòng)詞be來構(gòu)成，選B。

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請(qǐng)閱讀下列寓言小故事和故事寓意，從所給的六個(gè)選項(xiàng)（ A、B、C、D、E和F）中，選出附和各小題要求的最佳選項(xiàng)

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