he had a bad cold,-----he didn't attend the meeting A because B.because of which 选B. 前面是逗号,是非限定性定语从句. 句意:他得了重感冒,因此,他没有出席会议. 用because,句意:因为他没有出席会议,所以他得了重感冒.
B he had a bad cold, because of which he didn't attend the meeting。 他得了严重感冒,因为这个原因,他没有参加会议。 because of which: which 取代 a bad cold. 祝你学习进步!开心快乐! O(∩_∩)O 请采纳