問題詳情
29. Our teacher asks us to keep clean, so the classroom ____twice a day.
(A) must clean
(B) must be cleaning
(C) must be cleaned
(D) must have cleaned
參考答案
答案：C
難度：計算中-1
書單：沒有書單，新增
用户評論
【賀通過多益考試】評論
Our teacher asks us to keep clean, so the classroom must be cleaned twice a day.我們老師要求我們保持清潔，所以教室必須每天打掃兩次。