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
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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