问题
选择题
Another driver had just driven into the back of Jack's car ______ he was waiting at some traffic lights.
A．since
B．once
C．while
D．during
答案
答案：B
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Another driver had just driven into the back of Jack's car ______ he was waiting at some traffic lights.
A．since
B．once
C．while
D．during
答案：B