It___be the postman at the door.It's only six o"clock.这里为什么要用can't?
问题描述：
It___be the postman at the door.It's only six o"clock.这里为什么要用can't?
---Have you seen the film Under the Hawthorn Tree?
---Of course,I have.It was in our village ___it was made .这里为什么要用 that?
答
can't 表示否定的猜测,"不可能”(肯定用must,但否定只能用can't,mustn't 表示禁止）
It is +被强调的部分+that 从句：是强调句的固定句型,只能用that
(注：判断是不是强调句：将It is 和that 去掉,如果句子的结构还是完整的话,就是强调句）