A-A+
______ a satisfactory answer so he had to wri
问题详情
______ a satisfactory answer, so he had to write to them again.
A．As he hadn"t received
B．Not having received
C．Having not received
D．He hadn"t received
参考答案
正确答案：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。
