___I walked into class ,the teacher had started teaching alr
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___I walked into class ,the teacher had started teaching already
A.by the time
B.While
C.After
D.Before
A.by the time
B.While
C.After
D.Before
![___I walked into class ,the teacher had started teaching alr](/uploads/image/z/17084055-39-5.jpg?t=___I+walked+into+class+%2Cthe+teacher+had+started+teaching+alr)
选择D.
后面主句既然用了过去完成时,说明这个动作是在过去的过去,一定是发生在从句动作之前的.
所以是“在我走进班级之前,老师就已经上课了”.
后面主句既然用了过去完成时,说明这个动作是在过去的过去,一定是发生在从句动作之前的.
所以是“在我走进班级之前,老师就已经上课了”.
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短文改错When I walked into the classroom,the teacher was hangdin