—Mr.WangisinNanjingforatrip. —Oh,really?When

問題詳情：

 —Mr. Wang is in Nanjing for a trip.

 —Oh, really? When ______ he ______ the trip?

   A. does; start         B. will; start           C. did; start           D. is; starting

【回答】

C

知識點：動詞時態

題型：選擇題