国家开放大学 / 综合英语（3）
正确率：100%
He _ _ _ _ _ _ _ the metal spikes that guide the ropes and climbs up.
A.goes after
B.ponders over
C.pounds in
D.break through
A.goes after
B.ponders over
C.pounds in
D.break through
参考答案：
佳题速递：