问题
George would certainly have attended the meetings, _____.
A:has he not had a flat tyre
B:if he hadn’t a flat tyre
C:had he not had a flat tyre
D:if he hasn’t had a flat tyre
B:if he hadn’t a flat tyre
C:had he not had a flat tyre
D:if he hasn’t had a flat tyre
正确答案是：
