问题
选择题
The letter he had been looking forward to ____ at last .
A．arrive
B．arrives
C．arriving
D．arrived
答案
D
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。