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4．Tom ____ in the library every night over the last three months．（　　）

	A．	works		B．	worked
	C．	has been working		D．	had been working

分析句意：在過去的三個月里，Tom每晚都在圖書館里工作．

解答答案C．句中時間狀語over the last three months 通常與現在完成時連用，所以排除A、B和D選項．此處強調"Tom每晚在圖書館工作"這個動作從過去的三個月就開始一直持續到現在，還有可能會持續下去，因此用現在完成進行時，故選C．

點評 .本題考查時態的用法．解答此類題目的關鍵是要讀懂句意，分析上下文的語境，判斷時態，鎖定答案．

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