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18．Andy，can you answer the door？I _______the room．
OK，Mum．I'm coming．（　�。�

A．

clean

B．

cleaned

C．

am cleaning

D．

have cleaned

分析安迪，你能應門嗎？我正在打掃房間．
好的，媽媽．我馬上來．

解答答案：C．根據句意可知，應是說現在你能應門嗎，表示現在的動作，故本句應是表示正在打掃房間，應用現在進行時；現在進行時的結構為am/is/are+doing．故選C．

點評本題考查時態辨析，做題時應注意句子中暗含的時間，根據時間來確定發生的動作，進而判斷時態．

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