Mary ______ to see you . She _____ for you downstairs at the moment .
A．has come ; is waitingB．came ; is waitingC．has come ; waitedD．came ; was waiting
A
思考這道題時應(yīng)該使用逆向思維，即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之清晰起來?quot;瑪麗已經(jīng)到這兒來看望你"很明顯對表示對現(xiàn)在造成影響的動作要使用現(xiàn)在完成時態(tài)。
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