The classroom musta,clean b,be cleaned c,to clean d cleaning急,

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Theclassroommusta,cleanb,becleanedc,tocleandcleaning急,Theclassroommusta,cleanb,becleanedc,tocleandcl

The classroom musta,clean b,be cleaned c,to clean d cleaning急,
The classroom must
a,clean b,be cleaned c,to clean d cleaning
急,

The classroom musta,clean b,be cleaned c,to clean d cleaning急,
B
教室需要被打扫,要用被动

B.be cleaned 被动语态

教室被打扫,用被动,只有B.