Whenthebosscamein,theseworkerspretendedto　　　carefully.A...

问题详情：

When the boss came in, these workers pretended to　　　

carefully.

A. working                          B. be working

C. work                             D. have been work

ing

【回答】

B

知识点：现在进行时及其被动式

题型：选择题