Jack wasn’t saying anything，but the teacher smiled at him he had done something very clever．
A. as if
B. in case
C. while
D. though
网友回答
(答案→)A. as if
B. in case
C. while
D. though
解析：本题考查状语从句的用法。句意：杰克什么都不说，但是老师微笑着看着他笑他，好像他做了一些非常聪明的事。根据句意，空格处需要填入好像，仿佛。故选A。