Dr. Wang has made much contribution to the theories of modern physics at the____

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问题 Dr. Wang has made much contribution to the theories of modern physics at the______of his health.

选项 A、cost
B、disposal
C、mercy
D、expenditure

答案 A

解析考查固定搭配。at the cost of“以……为代价”；at the disposal of“由……处置”；at the mercy of“任……摆布”；expenditure不与at搭配，expenditure of表示“……的消费，支出”。根据词义可知，应选A。

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