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When the manager came in,the workers pretended________hard on their machines.
A.to workB.to be working
C.to have workedD.working
B

试题分析:考查不定式的用法。不定式的一般式表示的是与谓语动词同时发生,或者稍后发生;不定式的进行式表示的是和谓语动词同时发生的事情。To have done表示的动作是在谓语动词之前发生的事情。句意:当经理进来的时候,工人们假装在努力的工作。表示不定式的动作与谓语动词同时发生,故B正确。
点评:要注意不定式的动作与谓语动词的动作的先后关系,不定式的一般式表示的是与谓语动词同时发生,或者稍后发生;不定式的进行式表示的是和谓语动词同时发生的事情。To have done表示的动作是在谓语动词之前发生的事情。
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