where is mary [ ]she is in the librarya perhaps b may be

问题描述:

where is mary [ ]she is in the library
a perhaps b may be

A
B是Maybe
因为后面有IS不缺少谓语了,所以不能再有一个Be 两个动词放一块的情况

A
perhaps 或者maybe,但不是may be
maybe或许是副词
may be 可能……,做谓语。
Maybe she is at home now.
She may be at home now.

may be 情态动词表示推测