試題詳解

31Part Ⅲ Vocabulary and Structure (20 minutes) Directions:There are 30 incomplete sentences in this part.For each sentence there are four choices marked A),B),C) and D).Choose the ONE answer that bestcompletes the sentence.Then mark the corresponding letter on the Answer Sheet with a single line through the centre. .Such crimes may be so complex that months or years go by before anyone ________ them.
(A) discovered
(B) will discover
(C) would have discovered
(D) discovers