问题
选择题
This weekend we’re going to Beijing to attend a summer camp and we’ll visit the Bird Nest_______we get there.
A．when
B．if
C．once
D．until
答案
答案：A
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This weekend we’re going to Beijing to attend a summer camp and we’ll visit the Bird Nest_______we get there.
A．when
B．if
C．once
D．until
答案：A