The question is too difficult and we found ________．A.it not easy to answerB.it not easy to answer itC.it's not easy to answerD.it was not easy for us to answer it
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A解析本题考查it的用法．A、C两项中it代替the question，表示the question客观上很难，不是因人而异．B、D两项中it为形式引导词，表示主观上认为难，可能因人而异，据题意应选A项．