He promised to do what he ______ sure of _______.
A．could make; my happyB．could to make; me happy
C．could make; my happinessD．could to make; my happiness
D
本題句意“他許諾做他能做的保證使我幸福”。what he could (do)to make sure of my happiness，其中to make sure of my happiness做狀語。
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