Somebody in the next room must be ill, ______a doctor has just come out.

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问题 Somebody in the next room must be ill, ______a doctor has just come out.

选项 A、because
B、for
C、in that
D、as

答案B

解析 for连接一个原因分句,对前面的推测作原因上的解释。请考生记住:无论从逻辑推理还是从语法规则上看,只要前面是表示推测的句子,后面大都用for连接后一句,而不用其他连词。
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