They asked me to have a dinner in an excellent restaurant with the, I said that it was at least five years since I _______ a good meal.

A．had enjoyed

B．was enjoying

C．enjoyed

D．had been enjoying

下列各组地理事物或地理现象，形成的根本原因相同的是（　　）

A．长白山天池，黄土高原

B．撒哈拉沙漠，万里长城

C．喜马拉雅山脉，台湾海峡

D．大西洋，红海