Mary ___________to see you．She．_________ for you downstairs at the moment．
A．has come；is waitingB．came；is waiting
C．has come；waitedD．came；was waiting
A
解本題需要使用逆向思維，先考慮第二個(gè)空白處的選項(xiàng)，再考慮第一空白處的答案。因?yàn)榈诙渲薪淮艘粋�(gè)重要的時(shí)間狀語(yǔ)； at the moment （現(xiàn)在），因此應(yīng)毫不猶豫地選擇is waiting這一現(xiàn)在進(jìn)行時(shí)的時(shí)態(tài)。據(jù)此，第一句的句意也就隨著清晰起來(lái)：“瑪麗已經(jīng)到這兒來(lái)看望你�！焙苊黠@表示對(duì)現(xiàn)在選成影響的動(dòng)作使用在完成時(shí)態(tài)
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