-It'susefulforthedeafpeopletolearnsignlanguage．-Yes，it'...

问题详情：

-It's useful for the deaf people to learn sign language．

-Yes，it's a major way of _____ for them．

A．suggestion      B．vacation

C．production     D．communication

【回答】

D

知识点：名词

题型：选择题