问题
选择题
He waited with his companion_________the rescuers came, and then helped them carry her back down the mountain.
A．when
B．until
C．unless
D．while
答案
答案：B
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He waited with his companion_________the rescuers came, and then helped them carry her back down the mountain.
A．when
B．until
C．unless
D．while
答案：B