Question

【题目】这两个男孩自从上个月见面后就成了好朋友。

The two boys have been good friends________ ________ they met each other last month.

Answer 1

【答案】ever since

【解析】

ever since “自从”，短语前用现在完成时，短语后用一般过去时，用ever since引导时间状语从句。故填ever since。