Ann ___ worried about her birthday party that day.选项:were waswill beis为什么

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Ann ___ worried about her birthday party that day.
选项:
were
was
will be
is
为什么

was
因为后面用worried
而主语Ann是单数
所以用was

was
过去的事情,过去式

was
that day用过去时,Ann是第三人称

was
that day用过去时,Ann是第三人称