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单选题 28. Only when he returned from the exchange program________how much he enjoyed it.

A

he realized

B

he had realized

C

did he realize

D

had he realized

正确答案 :C

解析

本题考查部分倒装。
句意为“只有当他从交换项目回来时,他才意识到他有多么喜欢它”only修饰状语从句when he returned from the exchange program且放在句首时,句子应用部分倒装语序故选C。