Question

一道英语选择

I wonder how old Mike is .
Well,he went to school with my mother ,so he ______well over 50 .
A,must have been B might have been C may be D shall be
解释一下 谢谢

Answer 1

C
这是对现在的事实作以肯定的推测的， 排除A, B (情态动词may, must, might...)+ have+ 过去分词 用以对过去的事作以推测的）
D 中的shall 不可用于表推测

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Answer 2

你好。答案是C
50 years old 是“现在”的年龄，不是他上学时的年龄，所以不用A或者B.
A 或者B指的是对过去事情的猜测 “他超过50”是现在说话的时候的事情，所以是may be.
he may be well over 50 == it is possible that he is well over 50 years old.

Answer 3

A,must have been mike 和my mother 一起上学的 我母亲50多了 mike 也一定是50多了