61. By ... challenges explanation the author means that _________
A) no explanation is necessary for such an obvious phenomenon
B) no explanation has been made up to now
C) its no easy job to provide an adequate explanation
D) its high time that an explanation was provided
注:1.首句提出的观点和事实是矛盾的关系,所以选C。
2.no+名词结构是绝对化选项,最好不选,所以排除A和B项。
3.its high time that 早该做...后面接虚拟语气。
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