she__not have seen you yesterday,for she was not thereA could B might

问题描述:

she__not have seen you yesterday,for she was not there
A could B might

A
由she was not there可知,前面应该表示”不可能“

could 表示可能,might表示也许.could not=couldn't 表示不可能.后面说“因为她不在这儿”所以是A