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

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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