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TherehavebeencasessomeEnglishlearnerscan'tgettheirmessageacrosseventhroughtheyhavememorizedalotofwords.A.whichB.whenC.whereD.whatHowtochoose,translateandwhy?Thanks.

题目详情
There have been cases ____________ some English learners can't get their message across even through they have memorized a lot of words.
A.which B.when C.where D.what
How to choose,translate and why?Thanks.
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答案和解析
这个应该选择C 这是个定语从句,但是容易误选A,这个定语从句的先行词是cases ,不同于其他的一些简单的名词做先行词,cases指在一些情形下,定语从句来指出是哪些情形,宜用where .