题目内容：

The book store sells many different kinds of _____ (magazine).
填什么?

优质解答

The book store sells many different kinds of _magazines____ (magazine).

追问：

Did you see a man who ______(拉）a train with his teeth?

追答：

draw

追问：

请问为什么不填draws?

追答：

因为主句为一般过去时态。