2. 外语
  3. ______a satisfactory answer, so he had to write to them again.

______a satisfactory answer, so he had to write to them again.

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问题 ______a satisfactory answer, so he had to write to them again.
选项 A、As he hadn’t received
B、Not having received
C、Having not received
D、He hadn’t received
答案D
解析 本题考查的是简单句与并列句的区别。根据so一词可以看出这是两个并列句，而不是一个简单句，所以前面也是完整的句子，故选D。因为……所以，在英语中这两个连词不能同时用，故不选A。
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