问题补充:
When the manager came in,the workers pretendedhard on their machines.
A. to work
B. to be working
C. to have worked
D. working
答案:
A. to work
(答案→)B. to be working
C. to have worked
D. working
解析: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。
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