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15．-Lisa，why are you still here？School is over．
-I ______ my classroom yet，I need fifteen more minutes．（　　）

A．

don't clean

B．

haven't cleaned

C．

didn't clean

D．

won't clean

分析 -麗薩，你為什么仍在這兒？已經放學了．
-我還沒有打掃教室，我需要15分鐘．

解答答案：B 根據yet可知，已經或完成的動作對現在造成一定的影響，所以用現在完成時態，現在完成時態的結構為have/has+動詞的過去分詞，主語是I，所以助動詞用have，否定式結構為：haven't，故選B．

點評本題主要考查現在完成時，用法：表示過去發生或完成的動作對現在造成的影響或結果，還表示過去發生動作一直持續到現在．其結構是have/has+及物動詞的過去分詞．

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