Until then, Peter ( ) from his family for more than six months

Until then, Peter ( ) from his family for more than six months.
A、didn't hear
B、hadn't heard
C、hasn't heard
D、doesn't hear
【正确答案】：B
【题目解析】：until then 到那时为止，主句的谓语动词发生在then 之前，过去的过去，因此用过去完成时，句子含义到那时为止，他已经有六个月没有收到家人的来信。