高考英语一道语法单选题
高考英语单选Whatcausesyourheartattack?Itis__.
A.becauseofyouroverweight
B.yourbeingoverweight
C.becauseyouareoverweight
D.youaresooverweight
答案是B,想请高手帮忙解析其他几个选项错在哪?如何改成正确答案!