高中英语The telephone line to the headmaster is always busy.
问题描述：
高中英语The telephone line to the headmaster is always busy.
--------The telephone line to the headmaster is always busy.
--------Someone______the telephone.
A must use Bmust be using
为什么选B不选A?always不是总是的意思吗,应该用一般现在而不是现在进行啊?
答
校长的电话很忙,你每次打的时候总是占线.说明你打的那个时候电话正被某个人在用,故用肯定的猜测,时态应用现在进行时.