The doctors must have made great efforts to treat the patient, ______ he has recovered from his serious injury.

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问题 The doctors must have made great efforts to treat the patient, ______ he has recovered from his serious injury.

选项 A、though
B、before
C、for
D、but

答案C

解析 此题测试的是并列连词for连接原因分句的用法。表示原因的连接词有because,since,as,for等,其中除了for其他都是从属连词,只有for是并列连词,for的这种用法多出现在前一个分句是肯定推测的句子中,即must do或must have done,题句便是这种情况。for的这种用法在意义上起对前面的事情进行解释说明的作用。如:Some—one must be ill next door,for a doctor has just come out.
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