i am sorry _ you so much trouble,i really appreciate your help

问题描述:

i am sorry _ you so much trouble,i really appreciate your help
a:to give
b:to have given
c:giving
d:having given
请详细说明,最好说明每个选项的原因.

选b.
看全文知,是已经带来了麻烦,所以用b
sorry后要用不定式.只能是在a.b.中选.