Directions: There are 10 questions in this part of the test. Read the passag

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问题    Directions: There are 10 questions in this part of the test. Read the passage through. Then, go back and choose one suitable word or phrase marked A, B, C, or D for each blank in the passage.
The health-care economy is filled with unusual and even unique economic relationships. One of the least understood involves the  (41) roles of producer or "provider" and purchaser or "consumer" in the typical doctor-patient relationship. In most sectors of the economy, it is the seller who attempts to attract a  (42) buyer with various inducements of price, quality, and utility, and it is the buyer who makes the  (43)  . Where circumstances permit the buyer no choice because there is effectively only one seller and the product is relatively  (44)  , government usually asserts monopoly and places the industry under price and other regulations.  (45) of these conditions prevails in most of the health-care industry.
In the health-care industry, the doctor-patient relationship is the mirror image of the ordinary relationship between producer and consumer.  (46) an individual has chosen to see a physician-and even then there may be no real choice-it is the physician who usually makes all significant  (47) decisions: whether the patient should return "next Wednesday", whether drugs should be prescribed, etc. It is a rare and sophisticated patient who will  (48) such professional decisions or raise in advance questions about price, especially when the disease is regarded as serious.
This is particularly significant in  (49) to hospital care. The physician must certify the need for hospitalization, determine what procedures will be performed and announce when the patient may be  (50)  . [br] (46)

选项 A、Before
B、Because
C、Unless
D、Once

答案 D

解析空格所在的从句的意思是：……一个人已经决定看医生。主句的意思是：通常是医生在做出重要的……决定。从逻辑关系看，空格中应填入一个表示时间关系的连词。Before和Once均表示时间关系，但根据句意应选择D项Once。Because和Unless分别表示原因和条件，不符合上下文的逻辑关系。

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