--DidIlockthedoorwhenIwentout? ---Yes,youdid.Isawyou

問題詳情：

-- Did I lock the door when I went out?

  --- Yes, you did. I saw you _____ it.

   A. locking          B. lock                C. to lock          D. locked

【回答】

B

知識點：動詞和動詞短語

題型：選擇題