【题目】Don't pretend ________ hard. I know that you are reading a magazine at the same time.
A. to work B. working
C. to be working D. to have worked
在线课程【答案】C
【解析】考查动词不定式。句意：不要假装正在努力。我知道你同时正在看杂志。pretend to be doing sth.“假装正在做某事”，此处用动词不定式的进行式表示正在进行的动作，故选C。