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
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