if you had worked hard before ,you could not be worried about the coming exam now.为什么不...
问题描述：
if you had worked hard before ,you could not be worried about the coming exam now.为什么不...
if you had worked hard before ,you could not be worried about the coming exam now.为什么不是 would not be worried
答
因为could表示理论上或习惯上推测动作有发生的可能,而句子的前半句就是后半句推测的理由,而would却没有这个用法.