He pretended an important paper when the boss entered.A. to readB. to be readingC. to hav

问题补充：

He pretended an important paper when the boss entered.

A. to read

B. to be reading

C. to have read

D. to have been reading

答案：

A. to read

(答案→)B. to be reading

C. to have read

D. to have been reading

解析：考查不定式的用法：pretend后面可以接不定式做宾语，pretend to do假装将要做，pretend to be doing假装正在做，pretend to have done假装已经做了，句意：当老板进来的时候，他假装正在看一份重要的文件。选B。