问题补充:
He didn’t attend the meeting last night, he doesn’t know our plan for the picnic.
A. that’s why
B. that’s because
C. which is why
D. which is because
答案:
A. that’s why
B. that’s because
(答案→)C. which is why
D. which is because
解析:句意:他昨晚没有出席这个会议,那就是为什么他不知道我们野炊的计划。which 引导非限制性定语从句,而that是不能引导非限制性定语从句的,根据句意,故选C