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

試題分析：考查倒裝句。當否定詞或者半否定詞放在句首的時候，后面的主句使用部分倒裝的形式。本題中否定詞not放在了句首，故使用C正確。
點評：當否定詞或者半否定詞放在句首的時候，后面的主句使用部分倒裝的形式。另外注意only放在句首，且強調狀語的時候，句子也使用部分倒裝的形式。
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