Question

6. —What's that noise?

―There's a truck stopping outside. It's someone    something.

A. deliver           B. to deliver

C. delivering       D. delivered

Answer 1

6.    C考査非谓语动词。句意："那是什么声音？""外面停着一辆卡车。是送东西的人。"此处someone和deliver之间是主动关系，所以用现在分词作定语。故选C。