Jackwasn’tsayinganything,buttheteachersmiledathim

問題詳情：

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

【回答】

A

知識點：連詞

題型：選擇題