Question

I would have come earlier, but I ________ that you were waiting for me.

Answer 1

答案B
本题考查时态。题中有隐含虚拟语气。If
I
had
known
that
you
were
waiting
for
me,
I
would
have
come
earlier.可以知道是对过去事实相反的虚拟语气，故用一般过去时态。选B。