______that the most powerful microscopes cannot detect them.

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问题 ______that the most powerful microscopes cannot detect them.

选项 A、So small these particles are
B、So small are these particles
C、Such these particles are small
D、These particles are small so

答案B

解析 考查倒装。so+形容词置于主句句首,主句应该用倒装,本句为表语前置。
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