题文
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 |
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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 |
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