Having never met with such a problem, he felt and didn’t know how to solve it.A. puzzlin

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(答案→)A. puzzling; puzzled
B. puzzled; puzzling
C. puzzling; puzzling
D. puzzled; puzzled
解析：这题考察形容词的用法:puzzling”令人困惑的”,修饰物,第二空考察puzzled”感到困惑的”修饰人,句意是:从没遇到过这么困惑的问题,他感到很困惑,不知怎么解决.选A.