There __ ( be) heavy clouds on the hills. It __________ (begin)to rain.帮忙填一下啊!急需

问题描述:

There __ ( be) heavy clouds on the hills. It __________ (begin)to rain.
帮忙填一下啊!
急需

must
begins

were
began

are
will begin
该句子中又没说明是什么时态,前者说山上有很多云,后说说将会有雨.可见前者是正在见到的,而后面的 begin 有将来的意义,照我理解我想答案应该是这样的吧.