Question

_for the fact that she brokr her leg,she might have passed the exam.

Answer 1

考察的是虚拟语气~
当虚拟条件句的谓语动词含有were,should,had时，if可以省略，这时条件从句要用倒装语序，即把were,should,had等词置于句首，这种多用于书面语。
Should
he
agree
to
go
there,we
would
send
him
there.
　　要是他答应去的话，我们就派他去。
Were
she
here,she
would
agree
with
us.
　　如果她在这儿的话，她会同意我们的。
Had
he
learnt
about
computers,we
would
have
hired
him
to
work
here.
　　如果他懂一些电脑知识的话，我们已经聘用他来这里工作了。
Had
it
not
been
for
the
bad
weather
we
would
have
arrived
on
time.
若不是天气坏，我们就准时到达了。
所以这道题不是选B，是选A的~相信我哦~~
希望能帮到你O(∩_∩)O~