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，先考慮第二個空白處的選項，再考慮第一空白處的答案。因為第二句中交代了一個重要的時間狀語； 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)行時的時態(tài)。據(jù)此，第一句的句意也就隨著清晰起來：“瑪麗已經(jīng)到這兒來看望你�！焙苊黠@表示對現(xiàn)在選成影響的動作使用在完成時態(tài)
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