问题
选择题
B.副词训练
1. As he was waiting downstairs, he suddenly heard a voice calling from ____ .
A. over B. above C. up D. Upon
答案
答案:B
B.副词训练
1. As he was waiting downstairs, he suddenly heard a voice calling from ____ .
A. over B. above C. up D. Upon
答案:B