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9．My sister Lucy and I ______ homework in the room now．（　　）

A．

doing

B．

are doing

C．

D．

does

分析我和我的妹妹露西正在房間里做作業．

解答答案：B．
結合now推測設空處的句子的句意是"我和我的妹妹露西正在房間里做作業．"，由此判斷設空處的動作在說話時刻正在進行著，所以用現在進行時．現在進行時的構成是：主語+am/is/are+動詞的現在分詞；故答案為B．

點評本題考查了動詞的時態．做題時，一定要特別關注有關的時間短語，這是判斷句子時態的標志．在沒有時間狀語的情況下可以聯系上下文根據語境來做出正確判斷．

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