she explained ___ she was late because of the heavy traffic.应该填什么?
问题描述：
she explained ___ she was late because of the heavy traffic.应该填什么?
she explained ___ she was late because of the heavy traffic.A.what.B.if C.why D.不填 应该填什么?
答
D.不填
省略了that 的宾语从句.
she explained _that__ she was late because of the heavy traffic.