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【题目】 difficult problems they are?

A.What aB.howeverC.HowD.How a

【答案】C

【解析】

句意:它们有多难?

考查疑问句。根据题干 difficult problems they are?可知,设空处后面的problems为复数,所以前面不能用不定冠词a修饰,排除AD选项;且设空处位于句首,首字母要大写,排除B选项;所以只有C选项符合题意,故答案选C

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