Mr Smith, looking , started to work out a problem.
A. puzzled, puzzling
B. puzzling, puzzled
C. puzzled, puzzled
D. puzzling, puzzling
网友回答
(答案→)A. puzzled, puzzling
B. puzzling, puzzled
C. puzzled, puzzled
D. puzzling, puzzling
解析：考查形容词：puzzled“感到困惑的”修饰人或和人有关的表情，眼神等，puzzling“令人困惑的”修饰物，句意是：斯密斯先生看起来很困惑，开始解决这个令人困惑的问题。第一空是修饰Mr Smith，用puzzled，第二空是修饰problem，用puzzled。选A。