Question

【题目】—Do you know her well?

—Sure. We ________ friends since ten years ago.

A. were B. became

C. has become D. have been

Answer 1

【答案】D

【解析】句意：——你很了解她吗？——当然，我们自从十年前就是朋友。since引导的时间状语或状语从句，与现在完成时连用。主语we是第一人称，故谓语用非第三人称单数，故为have been，故选D。