Jack wasn’t saying anything，but the teacher smiled at him he had done something very clever. (2011·湖南，33)
A. as if
B. in case
C. while
D. though
网友回答
A. as if
B. in case
C. while
D. though
解析：A
解析 句意为：杰克什么也没说，但是老师朝着他笑，就好像他做了非常明智的事情一样。as if好像；in case以防万一；while当……时候，而，却；though尽管。由句意可知应选A项。