The necklace ______ unnoticed for several days before I found it.A.had laid B.had lain C.had been laying D.had been laid

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The necklace ______ unnoticed for several days before I found it.A.had laid B.had lain C.had been laying D.had been laid

The necklace ______ unnoticed for several days before I found it.A.had laid B.had lain C.had been laying D.had been laid
The necklace ______ unnoticed for several days before I found it.
A.had laid B.had lain C.had been laying D.had been laid

The necklace ______ unnoticed for several days before I found it.A.had laid B.had lain C.had been laying D.had been laid
D.had been laid
过去完成时的被动

D
后面的before I found it. 用的是过去时
前面应该用过去完成时态
然后被动的

d,被动语态 因为found 是过去是,所以是d最完整

C