under no circumstance （） our car tomorrow?a are they to borrow b could they be borrowing
问题描述：
under no circumstance （） our car tomorrow?a are they to borrow b could they be borrowing
选哪个为什么?
答
a 把倒装句正过来看就明白了,they are to borrow our car tomorrow.
b 不通顺 they could be borrowing our car tomorrow,进行时和明天矛盾.