There _____sign of life on Mars.

题目

There _____sign of life on Mars.
A.seem to be B.seems not to be C.seems to be no D.isn’t seem to be
是不是 C啊,其他几个为什么错

答案

B.seem 是系动词,和be,become 等一样,变成否定时后面直接加 not.
seem 也可以是实义动词,和大多数动词一样,否定时前面加 do/does not.