He locked the door, ______. 选项: a、made sure no o

问题描述:

He locked the door, ______. 选项: a、made sure no o
He locked the door, ______.
选项:
a、made sure no one would interrupt him
b、making sure no one would interrupt him
c、to made sure no one would interrupt him
d、to makeing sure no one would interrupt him
选什么?为什么?谢谢!

选b,现在分词作伴随状语.