He found           very difficult           the math problem．
A．that；to solveB．this；solving
C．it；to solveD．it；solving
C

試題分析：句意：他發(fā)現(xiàn)解決這道數(shù)學(xué)問題很難.find it + adj. +to do結(jié)合句意，故選C
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