【题目】Cathy stopped working when her son was born __________ she could stay home and take care of him.
A. even if B. so that C. unless D. while
在线课程【答案】B
【解析】考查目的状语从句。A. even if即使；B. so that为了------；C. unless 除非；D. while当---时候，在---期间。句意：当儿子出生的时候Cathy为了留在家里照顾他，她停止了工作。故选B。