（2012安徽卷）Ａlot 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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（2012安徽卷）Ａlot 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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