After nine years’hard-work finally his dream came true.A. at the endB. at the momentC. at

问题补充：

After nine years’hard-work, finally his dream came true.

A. at the end

B. at the moment

C. at once

D. at last

答案：

A. at the end

B. at the moment

C. at once

(答案→)D. at last

解析：at the end最后，在终点；at the moment此刻，当时；at once 立刻，马上；at last最后，终于。句意：在九年的努力工作之后，他的梦想终于实现了。结合语境可知选D。