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【題目】We for three hours already．Let's stop a break．

A．have worked；to have

B．worked；to have

C．have worked；having

D．have worked；to having

【答案】A

【解析】

試題分析：句意：我們已經(jīng)工作三個小時了，讓我們停下來休息一下吧。根據(jù)for three hours already可知該用現(xiàn)在完成時。Stop doing sth停止正在做的事；stop to do sth停下來去做另外一件事。所以選A。

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