问题
选择题
. What caused the accident ______ on the road.
A．were stone
B．were stones
C．was stone
D．was stones
答案
答案：D
搜题请搜索小程序“爱下问搜题”
. What caused the accident ______ on the road.
A．were stone
B．were stones
C．was stone
D．was stones
答案：D