【題目】The window of the classroom _________for about three hours .Please go and close it.

A. has opened B. has been open

C. has been opened D. opened

【答案】B

【解析】

試題分析：句意為：教室的窗戶已經(jīng)開了大約三個小時了。請去把它關(guān)上。在英語中，“open（開）”為短暫性動詞，不可用于表示一段時間的現(xiàn)在完成時句子中。但是其“開”的狀態(tài)是可以延續(xù)的，可以用于表示一段時間的現(xiàn)在完成時句中。結(jié)合選項可知應(yīng)選B。

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