_______ his return from America, he got down to his research.
A．WhileB．InC．AsD．On
D

試題分析：考查固定句型結構。on+n/v-ing表示”一....就”。句意：他一從美國回來，就著手他的研究。故選D。As作介詞時意思是“作為”，while不能做介詞。
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