—IsTomintheofficenow?—No,heisout.Butnooneknows

問題詳情：

— Is Tom in the office now?

— No, he is out. But no one knows ________.

A、    where he has been       B. where he has gone       C. where has he gone      

【回答】

B

知識點：賓語從句

題型：選擇題