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试题详情及答案解析
He found          very difficult          the math problem.
A.that;to solveB.this;solving
C.it;to solveD.it;solving
答案:C
试题分析:句意:他发现解决这道数学问题很难.find it + adj. +to do结合句意,故选C
考点:考查动词的用法