问题
单项选择题
All the rubber bales were separated（）.
A.by grade
B.by a grade
C.by the grade
D.by the grades
答案
参考答案：A
搜题请搜索小程序“爱下问搜题”
All the rubber bales were separated（）.
A.by grade
B.by a grade
C.by the grade
D.by the grades
参考答案：A
