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【題目】﹣Why are the windows so dirty?

﹣Because we __________ them for a long time.

A．have cleaned

B．haven’t cleaned

C．didn’t clean

【答案】B

【解析】

試題分析：句意：――窗戶為什么那么臟？――因為我們很長時間沒有打掃了。根據for a long time可知本句用現在完成時。結合句意，故選B

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