A:is surrounding
B:is surrounded
C:surrounded
D:surrounding
—Sorry____(must).
解释句中加线词语
可是水越涨越高,把高原和山脉也淹没了。
下列运算中,计算结果正确的是( )
The public bikes are r____ by many tourists along the West Lake.
为使黄土高原社会、经济得到可持续发展.必须做到( )