问题
选择题
Isn't it time you got down to _____ the papers? [ ]
A. mark
B. be marked
C. being marked
D. marking
答案
答案：D
搜题请搜索小程序“爱下问搜题”
Isn't it time you got down to _____ the papers? [ ]
A. mark
B. be marked
C. being marked
D. marking
答案：D