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

試題分析：考查非謂語(yǔ)動(dòng)詞。句型S（人，物）+ be + adj. + to do，句子的主語(yǔ)在邏輯關(guān)系上為不定式動(dòng)作的賓語(yǔ)，to do中的動(dòng)詞是及物動(dòng)詞時(shí)，不用被動(dòng)，不及物動(dòng)詞后要接介詞。句意：這道數(shù)學(xué)題看起來非常容易，但事實(shí)上卻很難解出來。故A正確。
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