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：考察连词辨析。A似乎；B以防；C当…时；然而；尽管；D尽管；句意：Jack什么也没有说，但是老师对他微笑似乎他做了一些很聪明的事情。根据句意说明A正确。