Alotoflanguagelearning,　　　hasbeendiscovered,ishappening...

问题详情：

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

知识点：定语从句

题型：选择题