Jack pretended to be deaf ________ I was speaking to him.

Jack pretended to be deaf ________ I was speaking to him.
A、while
B、since
C、until
D、before
【正确答案】：A
【题目解析】：while当...时；since自...以来；until直到；before在...之前
句意：我和杰克说话时，他假装聋了。