The math problem was _________ difficult __________ none of us worked it out.
A．very; thatB．too; toC．so; thatD．enough; that
C

試題分析：句意：這道數(shù)學(xué)題太難了以至于我們中誰也做不出來。so...that...如此……以至于……；too...to...太……而不能,to后接動詞。故選C.
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