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 |