摘要： on duty 值日,值班 on foot 步行;走路
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从所给的四个选项中选择最佳答案
John and Jim come to school very early because they're _______ today.
[ ]
A． on duty B．in duty
C． on their duty D．in their duty
查看习题详情和答案>>It's time ________ him ________ on duty.
[ ]
|
A．for, being |
B．for, to be |
C．of, being |
D．of, to be |
It's time ________ him ________ on duty.
[ ]
|
A．for, being |
B．for, to be |
C．of, being |
D．of, to be |
The classroom ________ every day by the students on duty.
[ ]
|
A ．is cleaning |
B ．cleans |
C ．is cleaned |
D ．are cleaned |