Only when class began ________ that he had lost his bag in the street.

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问题 Only when class began ________ that he had lost his bag in the street.

选项 A、will he realize
B、he did realize
C、did he realize
D、should he realize

答案C

解析 本题考查倒装结构。当“only+状语/状语从句”位于句首时,主句要用部分倒装结构,即将助动词do或情态动词放在主语前面。又因为主句的时态为过去时,所以答案为C。
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