问题
选择题
---When did you see the bird last night?
---It was at about ten thirty ______ I got home.
A．before
B．when
C．that
D．until
答案
答案：B
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---When did you see the bird last night?
---It was at about ten thirty ______ I got home.
A．before
B．when
C．that
D．until
答案：B