Question

【题目】I will forever remember a certain occasion________we were in trouble and at that moment our best friend gave us a hand.

A．where B．which

C．why D．when

Answer 1

【答案】D。

【解析】考查定语从句。先行词是occasion，根据后面的时间状语at that moment可知 occasion指时间，从句中缺少的是状语，故要使用关系副词when，相当于at which time。句意：我会永远记住当我们有麻烦时，我们最好的朋友帮助了我们。