Alotoflanguagelearning,　　　hasbeendiscovered,ishappening...

問題詳情：

A lot of language learning, 　　　has been discovered, is happening in the first year of life, so parents should talk much to their children during that period.

A. as               B. it               C. which            D. this

【回答】

A

知識點：定語從句

題型：選擇題