问题
选择题
Sydney promised her that he would always do anything he could for her to ____of her happiness.
[ ]
A. making sure
B. be sure
C. being sure
D. make sure
答案
答案：D
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Sydney promised her that he would always do anything he could for her to ____of her happiness.
[ ]
A. making sure
B. be sure
C. being sure
D. make sure
答案：D
，其中L0为（）