2. 外语
  3. Thermal expansion of solid is ______ detected by our naked eyes.

Thermal expansion of solid is ______ detected by our naked eyes.

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问题 Thermal expansion of solid is ______ detected by our naked eyes.
选项 A、small so as not be
B、so small as not be
C、so small as not to be
D、such small as not to be
答案C
解析 结构so+a．／ad．+as to do和such+n．+as to do都可用来表示结果，意为“如此……以至于”。表示否定时，在不定式前加not，故C正确。
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