问题

Thethief______whenhewasstealingawalletfromawoman
A:happenedtonotice
B:wastakenplacetonotice
C:washappenedtobenoticed
D:happenedtobenoticed
B:wastakenplacetonotice
C:washappenedtobenoticed
D:happenedtobenoticed
正确答案是:
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