Onlywhen

問題詳情：

Only when _______ home_____ that he had left his bag in the taxi he had taken.

   A. he returned; did he realize     B. did he return; did he realize

   C. he returned; he realized       D. did he return; he realized

【回答】

A

知識點：倒裝與省略

題型：選擇題