______ 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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