问题
选择题
The volunteers for the Shanghai World Expo are busy from dawn ______ dust but they feel very proud of it.
A．at
B．on
C．till
D．in
答案
答案：C
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The volunteers for the Shanghai World Expo are busy from dawn ______ dust but they feel very proud of it.
A．at
B．on
C．till
D．in
答案：C