用must,might,can’t,could填空The owner be a boy because the earrings be a present for his mother.
问题描述：
用must,might,can’t,could填空
The owner be a boy because the earrings be a present for his mother.
答
must,could
must be 一定是，表肯定猜测
can't be 一定不是，表否定猜测
may/could be 表不确定的推测
答
The owner ( can't ) be a boy because the earrings (must) be a present for his mother.
姑且这么填了.但是总觉得少了点东西,前后没有直接的因果关系.