.He is really an excellent doctor and he is to becoming an expert in this field. A. in a

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A. in a way
B. by the way
(答案→)C. on the way
D. under the way
解析：短语辨析。in a way在某种程度上； by the way 顺便说说；on the way 在途中，正要成为；under the way在……方式下。句意：他是一个真正不错的医生，并且他正在成为这个领域的专家。故选C。