一道英语单选.急

问题描述:

一道英语单选.急
If you live in the country or have ever visited here ,__are that you have heard birds singing to welcome the new day .空格选chances而不选possibilities或situations的原因.→_→

chances are that...意思为有可能,固定搭配.如:The chances are that the new machine will arrive tomorrow.新机器可能明天运到.