He had a bad cold, ________ he didn’t attend the meeting．
A.becauseB.because of whichC.to whichD.because of that在线课程B
根据句意“他得了重感冒，因此没能出席会议”排除A项，介词+关系词不包括that，排除D项，根据搭配，选择because of which。