题目
—Do you know each other?
—Yes,of course.And we have been friends we first met.( )
A.
since
B.
while
C.
before
D.
after
知识点:过去将来时的被动语态章节:句法 / 被动语态
—Do you know each other?
—Yes,of course.And we have been friends we first met.( )
since
while
before
after
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