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题目内容
（大学英语）
49. 27、________ that no one could see them even with very powerful microscopes.
A、 So are the electrons small
B、 So small the electrons are
C、 So small are the electrons
D、 So the electrons are small
A、 So are the electrons small
B、 So small the electrons are
C、 So small are the electrons
D、 So the electrons are small
参考答案