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4．---Mum，may I go out and play basketball？
---Well，if you _______ your homework，you can．（　�。�

A．

finishing

B．

finished

C．

have finished

D．

will finish

分析 --媽媽，我可以出去打籃球嗎？
--哦，如果你已經做完作業了，你可以去．

解答答案：C．
根據if you _______ your homework，you can，可知這里的意思是如果你已經做完作業了，你可以去，if引導條件狀語從句，這里用現在完成時，表示過去發生的動作對現在造成了影響，作業已經做完．故選C．

點評聯系前后語境，在準確把握前后句關系的基礎上，先推測出大體句意；再結合關鍵詞利用其固定用法選出正確答案．

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