问题
选择题
He promised to do what he ______ sure of _______.
A．could make; my happy
B．could to make; me happy
C．could make; my happiness
D．could to make; my happiness
答案
答案：D
本题句意“他许诺做他能做的保证使我幸福”。what he could (do)to make sure of my happiness，其中to make sure of my happiness做状语。