高等继续教育 / 电子商务英语
正确率：100%
题型描述: 单选题
He would have given more help, but he ＿＿＿＿＿＿＿so busy.
A.has been
B.isx
C.had been
D.would be
He would have given more help, but he ＿＿＿＿＿＿＿so busy.
A.has been
B.isx
C.had been
D.would be
参考答案：