13、He was puzzled by this phenomenon．He began to try every approach the best way of working it out．
A．known finding B．knowing to find C．known to find D．knowing finding
科目：高中英語 來源： 題型：
He was puzzled by this phenomenon．He began to try every approach the best way of working it out．
A．known finding B．knowing to find C．known to find D．knowing finding
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