When the teacher came in the students pretended the text.A. to readB. reading C. to have

问题补充：

When the teacher came in, the students pretended the text.

A. to read

B. reading

C. to have read

D. to be reading

答案：

A. to read

B. reading

C. to have read

(答案→)D. to be reading

解析：动词短语pretend to do sth假装做某事；如果不定式的动作是已经完成的就使用不定式的完成式，如果是正在进行的就使用不定式的进行式。句义：当老师进来的时候，学生们假装在看书。根据句义可知本句表示的是老师进来时正在发生的情况，所以使用不定式的进行时。故D正确。