Question

【题目】They _______ for the Winter Olympics since 5 years ago.

A. train B. trained C. is training D. have trained

Answer 1

【答案】D

【解析】句意：自从5年前，他们已经为冬奥会训练。与since引导的时间状语或时间状语从句连用，用现在完成时，故选D。