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____doesn't seem to have been any difficulty solving theprob

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____doesn't seem to have been any difficulty solving theprobelm.
A.It B.He C.There D.that
选择哪个呢?为什么?
一般来讲,应该是A!
NO it's not A. 关键在于"been". Answer is C.
It doesn't seem to have any difficulty "it" 就指"那个", 可以指猫猫狗狗反正不是人.
There doesn't seem to have been any difficulty, have been 就把意思改了, 变成"好像没有任何难题/问题". 是指一种情况"有没有过...(问题)"