【題目】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

【答案】A

【解析】考查定語從句。as 引導(dǎo)的定語從句位置比較靈活，可以置于句首，句中或句末。as為代詞，代指“語言學(xué)習(xí)在出生后的第一年就已經(jīng)開始發(fā)生”這件事。which引導(dǎo)的定語從句只能放在句末。

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