Mary ( )( ) her key to the bicycle yesterday.为什么是couldn't find,而不是found?

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Mary ( )( ) her key to the bicycle yesterday.为什么是couldn't find,而不是found?

Mary ( )( ) her key to the bicycle yesterday.为什么是couldn't find,而不是found?
Mary ( )( ) her key to the bicycle yesterday.
为什么是couldn't find,而不是found?

Mary ( )( ) her key to the bicycle yesterday.为什么是couldn't find,而不是found?
could 情态动词,后接动词原形.
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应为是发生过的事情,所以应该用过去时