LZ你是不是觉得discover要用过去时加ed?
这个句子是说许多犯罪复杂到人们很久以后才能发现,
在这里犯罪的时候是过去 .
相对被发现时就是现在.
为什么加s呢?楼上说了 是由于anyone
英语单选Such crimes may be so complex that months or years go by
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