问题
选择题
The classroom every day.
A．should clean
B．should be cleaned
C．should cleaned
D．should be cleaning
答案
答案：B
由题意可知用被动语态。
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The classroom every day.
A．should clean
B．should be cleaned
C．should cleaned
D．should be cleaning
答案：B
由题意可知用被动语态。