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Not for a moment ______ that this disease was caused by certain virus.
A.he have doubted B.he doubtsC.did he doubtD.he did doubt
C

试题分析:考查倒装句。当否定词或者半否定词放在句首的时候,后面的主句使用部分倒装的形式。本题中否定词not放在了句首,故使用C正确。
点评:当否定词或者半否定词放在句首的时候,后面的主句使用部分倒装的形式。另外注意only放在句首,且强调状语的时候,句子也使用部分倒装的形式。
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