用电动牙刷刷牙在一百年前似乎是不可能的.It to brush teeth with electric toothbrushes a hundred years ago. 题目和参考答案——青夏教育精英家教网—

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21. 用电动牙刷刷牙在一百年前似乎是不可能的。

It__________ __________ to brush teeth with electric toothbrushes a hundred years ago.

21. seemed impossible

题目来源：2015名校课堂滚动学习法八年级英语上册人教版 > Self Check

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( ) 31. A. it B. he

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