有关被动语态.--When will the lecture begin --When the students ____.A.have satB.sat downC.will sitD.are seated

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有关被动语态.--When will the lecture begin --When the students ____.A.have satB.sat downC.will sitD.are seated
有关被动语态
.--When will the lecture begin
--When the students ____.
A.have sat
B.sat down
C.will sit
D.are seated

有关被动语态.--When will the lecture begin --When the students ____.A.have satB.sat downC.will sitD.are seated
be seated=====sit down
注意:这里不选B,因为时态不配,并非词汇不对.