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

问题描述:

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

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)