The girl feels sad because the buildings ______.是填fall down还是fell down ,为什么?

问题描述:

The girl feels sad because the buildings ______.是填fall down还是fell down ,为什么?
紧急

用fell down,因为是表示对过去发生的事情感到难过.
because前后的时态可以不一致,根据语境而定.