She removed hat she was wearing and tried on black silk one.A. a; a B. the; theC. the; a

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A. a; a
B. the; the
(答案→)C. the; a
D. a; the
解析：C 考察冠词。句义：她摘下她正戴着的帽子，实戴了一下一顶黑色的丝绸帽。第一空特指当时他正戴着的帽子，使用the;第二空泛指一顶黑色的帽子，形容词black是以辅音因素开头的词，故用不定冠词。