Question

【题目】Lin Bo and I friends since we were at school.

A. will be B. have become

C. have been D. will become

Answer 1

【答案】C

【解析】句意：我和林波自从上学时，就已经成为朋友。since引导的时间状语从句与现在完成时连用，表示持续一段时间，故谓语用延续性动词。have become是短暂性动词，不与时间段连用。have been是延续性动词，可与时间段连用。故选C。