He promised to do what he ______ sure of _______.A.could make; my happyB.could to make; me happyC.could make; my happinessD.could to make; my happiness
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D解析本题句意“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。