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

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

出自：大学英语

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