题目内容：

It was ____problem that ____ of the students could work it out .
A.so hard a ;a few
B.so hard a ;few
C.such hard a;few
D.such a hard; a few

优质解答

B
so + 形容词+ 不定冠词+ 名词中心词 “如此的.”
so hard a problem= such a hard problem
few 表否定, 符合句意
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