I can give you an example of marry cases ________ students obviously knew a lot of English words and expressions but ________ write a good seeay.A.why; can'tB.when; wouldn'tC.where; couldn'tD.as; had to
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C解析导解：本句第一空用where引导定语从句表示“在这种情况下”，第二空用情态动词的过去式与前句时态一致，表示过去的情形．