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

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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