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13．Tell me the answer please； I over this question for weeks now．（　　）

	A．	puzzle		B．	puzzled
	C．	had puzzled		D．	have been puzzling

分析告訴我答案吧，這個問題都讓我困惑好幾周了．

解答答案：D
題干中now表明動作持續(xù)的時間是從過去到現(xiàn)在，要用完成時態(tài)；句意強調(diào)的持續(xù)進行，不間斷的動作，是現(xiàn)在完成進行時態(tài)的用法．故選D．

點評現(xiàn)在完成進行時表示動作從某一時間開始，一直持續(xù)到現(xiàn)在，或者剛剛終止，或者可能仍然要繼續(xù)下去．

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