单项选择题

______, explorers could never have found the cave.

A．But for the fissure had been spotted
B．If not the fissure had been spotted
C．Had the fissure not been spotted
D．Had not the fissure been spotted
<上一题 目录 下一题>
热门 试题

单项选择题
Everyone should be ______ innocent until it is proved that he is guilty.
A．presumed
B．assumed
C．resumed
D．consumed
单项选择题
Nuclear power plants, ______ to some serious breakdowns, have become a center of controversy.
A．having recently been subjected
B．recently having been subjected
C．have recently subjected
D．recently have subjected
相关试题