-Ican'tfindMary.Where'sshe?    -Sorry,Idon'tknow

問題詳情：

 -I can't find Mary. Where's she?   

 - Sorry, I don't know _______.

A. where has she been            B. where she has gone 

C. where has she gone            D. where she has been

【回答】

B

知識點：賓語從句

題型：選擇題