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英语
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my mother thinks ___ important to clean the birdcage every day
a) that
b) this
c) it
d) /
请问选什么?为什么不能用 it's
人气：213 ℃ 时间：2020-02-03 13:06:03
解答
C
因为it是形式主语,实际主语是clean the birdcage every day
高一要学的.
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