---Icametoseeyouthismorningbutyouweren’tinyouroffice.--...

問題詳情：

---I came to see you this morning but you weren’t in your office.

---It must have been                 I was having a meeting in the meeting room.

A. why                           B. what                          C. when                         D. where

【回答】

C

知識點：複合句

題型：選擇題