It ______ nearly two weeks _________ I had received his letter.A.is,that B.was,that C.is,since
问题描述：
It ______ nearly two weeks _________ I had received his letter.A.is,that B.was,that C.is,since
说明理由
A.is,that \x09B.was,that\x09C.is,since\x09D.was,since
答
was since为什么前者表示过去一个事实，用一般过去时。since 带出过去时段（差不多两个礼拜）的起点，过去的过去，得用过去完成时。