Those math problems were so difficult that___students worked them out

Those math problems were so difficult that___students worked them out

题目
Those math problems were so difficult that___students worked them out
A.few B.a few C.little D.a little
答案
选择A.so.that.如此..以致于.,句子的意思是,这些数学题是如此的难,以致于几乎没有一些学生可以做出来."students"是复数,且可数,所以排除C.D(little,a little是修饰不可数名词)B.a few表示一些,与句子意思不是最恰当...
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