This is______ difficult problem that few...

This is______ difficult problem that few students can work it out.

A. so B. so a C. such D. such a

D 【解析】试题分析：句意：这是如此难的题以至于几乎没有学生算出它。So，如此，那么，用法是so+形容词，such,如此，那么。用法是：such+(a/an)+(形容词)+名词，但名词前有few,little,many,much修饰时只用so，故选D 考点：考查固定用法。

考点分析：

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