--These books ____ in the library for along time .--I think they are too old to be read .A.have kept B.had kept C.have been kept D.were kept顺便也告诉我第一句话是什么时态啊

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--These books ____ in the library for along time .--I think they are too old to be read .A.have kept B.had kept C.have been kept D.were kept顺便也告诉我第一句话是什么时态啊

--These books ____ in the library for along time .--I think they are too old to be read .A.have kept B.had kept C.have been kept D.were kept顺便也告诉我第一句话是什么时态啊
--These books ____ in the library for along time .--I think they are too old to be read .
A.have kept B.had kept C.have been kept D.were kept
顺便也告诉我第一句话是什么时态啊

--These books ____ in the library for along time .--I think they are too old to be read .A.have kept B.had kept C.have been kept D.were kept顺便也告诉我第一句话是什么时态啊
C
主语是物,要用被动语态,排除A与B,根据FOR A LONG TIME 可知是现在完成时的被动语态,再排除D
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