The letter he had been looking forward to at last .A. arriveB. arrivesC. arriving D. arri

问题补充：

The letter he had been looking forward to at last .

A. arrive

B. arrives

C. arriving

D. arrived

答案：

A. arrive

B. arrives

C. arriving

(答案→)D. arrived

解析： 考查句子结构。此题缺少谓语，he had been looking forward to为定语从句，省略了关系词that/which。句子的主干为：The letter arrived at last.句意：他一直期望的那封信终于到达了。故选D。