Surveys show that______ less sleep than we think,______ too much sleep could even harm our health.

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问题 Surveys show that______ less sleep than we think,______ too much sleep could even harm our health.

选项 A、not only do we need; but also
B、not only we need; but also
C、not only do we need; but that
D、not only we need; but that

答案C

解析 本题考查倒装结构。not only开头,其后需部分倒装(助动词+主语+谓语主要动词+其他),故首先排除[B]项和[D]项。too much sleep could even harm our health为完整句子,第二个空格只能填but that,故答案为[C]项。not only…but that中,有时候可把that省略,但but后仍然是完整句子。not only…but also中,各自后面只能接对等的某一成分或词语,而不能接句子。
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