Question

_____her before, he didn`t know she was his aunt.

Answer 1

选B.
省略之后否定词要提前，这是其一。
二，题目中只要有before你就要选完成时，是过去的时间就用过去完成，是现在的时间就用现在完成。（一定要记住这个做题法宝）
三，Not
havingseen =Because
he
had
not
seen
her
before。这是过去完成，表示过去的过去，与后面的he
didn`t
know
she
was
his
aunt.过去式形成了逻辑上的连贯。转换成汉语就是“因为他之前没有见过他的aunt，所以他不知道她”