The doctors must have made great efforts to treat the patient ______ he has recovered fro

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

A.though

B.before

C.for

D.but

请帮忙给出正确答案和分析,谢谢!

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答案解析

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  • 正确答案:C
    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mustdo或musthavedone,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—onemustbeillnextdoor,foradoctorhasjustcomeout.