I wasted an hour____ to the library only ____ it was closed

题目

I wasted an hour____ to the library only ____ it was closed
A:to go,finding B:going,finding C:to go .to find D:going,to find

答案

选D.waste time doing sth表示浪费多少时间做某事
only to find表示发现……（常加出人意料的结果）