【題目】 difficult problems they are?

A.What aB.howeverC.HowD.How a

【答案】C

【解析】

句意:它們有多難?

考查疑問句。根據(jù)題干 difficult problems they are?可知,設空處后面的problems為復數(shù),所以前面不能用不定冠詞a修飾,排除AD選項;且設空處位于句首,首字母要大寫,排除B選項;所以只有C選項符合題意,故答案選C。

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