Only when class began______that he had lost his bag in the street.A、will he real

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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，即将助动词或情态动词放在主语前面，且主句的时态为过去时，所以答案为C)。

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