问题补充：
单选题
Whether you believe it or not, it is ________ that causes your illness．A.because of your being overweightB.your being overweightC.because you are overweightD.you are so overweight
网友答案：
热心网友 1楼
B解析这是一个强调结构，对原句中的主语your being overweight进行强调。because 引导的从句和because of短语不能作主语。
