The two brothers have never been back < >they left their hometown.A.sinceB.forC.whenD.before

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The two brothers have never been back < >they left their hometown.A.sinceB.forC.whenD.before
The two brothers have never been back < >they left their hometown.
A.since
B.for
C.when
D.before

The two brothers have never been back < >they left their hometown.A.sinceB.forC.whenD.before
A
since+一般过去时从句,主句用完成时.

A

A 现在完成时,用since接时间点。自从那两兄弟离开家乡,他们就没有回去过。

A since. since是自从的意思。
句意:自从他们离开他们的家乡,这两个兄弟再没回来过。

A
一般过去式 自从。。。。