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The math problem seems very easy, but in fact it is very difficult_______.
A.to work outB.being worked outC.working outD.to be worked out.
A

试题分析:考查非谓语动词。句型S(人,物)+ be + adj. + to do,句子的主语在逻辑关系上为不定式动作的宾语,to do中的动词是及物动词时,不用被动,不及物动词后要接介词。句意:这道数学题看起来非常容易,但事实上却很难解出来。故A正确。
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