After two years of working on the subject, he seriously switched his field again, ______ to comparative anatomy and physiology.

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问题 After two years of working on the subject, he seriously switched his field again, ______ to comparative anatomy and physiology.

选项 A、transferring
B、gliding
C、transforming
D、drifting

答案A

解析 选择A项的参照是短语switched the filed。总体上说,选择正确答案的一个重要途径是寻找参照,这就如同“找路”凭借“参照物”一样。
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