【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(wèn)句。根據(jù)題干 difficult problems they are?可知，設(shè)空處后面的problems為復(fù)數(shù)，所以前面不能用不定冠詞a修飾，排除A、D選項(xiàng)；且設(shè)空處位于句首，首字母要大寫(xiě)，排除B選項(xiàng)；所以只有C選項(xiàng)符合題意，故答案選C。

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