小儿最早能准确地运用“妈妈”、“爸爸”两词的时间是()
A.0~3个月
B.3~6个月
C.6~9个月
D.9~12个月
E.12~18个月
参考答案:D
—Is that her book?
—Yes, ______. It is nice.
A.it’s
B.it is
C.it is not
D.it isn’t
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