问题标题：
【一道高考模拟题Suchcrimesmaybesocomplexthatmonthsoryearsgobybeforeanyone___them.Suchcrimesmaybesocomplexthatmonthsoryearsgobybeforeanyone___them.A、discoveredB、willdiscoverC、wouldhavediscoveredD、dis】
问题描述：
一道高考模拟题Suchcrimesmaybesocomplexthatmonthsoryearsgobybeforeanyone___them.
Suchcrimesmaybesocomplexthatmonthsoryearsgobybeforeanyone___them.
A、discoveredB、willdiscoverC、wouldhavediscoveredD、discovers
为什么选D?为什么不选C?would除了是will的过去式以外,它还可以是个情态动词,那wouldhavedone就一定是过去将来完成时吗
牛小林回答：
是选D.表示一般情况.wouldhavedone还可以表示为本可以做什么却没做.
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