-Have you found out the telephone number I need? -Yes.but .I have sit here for n

—Have you found out the telephone number I need？

—Yes，but ______，I have sit here for nearly a half hour.

A.for finding it out B.to find it out

C.for finding out it D.to find out it

试题答案

B

从句中上下文看，空白处填一个表目的的不定式才符合句意，for加动名词不能表目的，故A、C两项不对。D项不合语法。