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

問題詳情：

-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

知識點：名詞

題型：選擇題