高等继续教育 / 大学英语II
正确率：100%
题型描述: 单选题
He must have heard the bad news, he looks upset.
A.when
B.because
C.for
D.as
He must have heard the bad news, he looks upset.
A.when
B.because
C.for
D.as
参考答案：
佳题速递：