John and Mary_____each other pretty well before they got married.A.knew B.know C.had known D.have known

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John and Mary_____each other pretty well before they got married.A.knew B.know C.had known D.have known
John and Mary_____each other pretty well before they got married.
A.knew B.know C.had known D.have known

John and Mary_____each other pretty well before they got married.A.knew B.know C.had known D.have known
c
before前面一般用完成时,因为后面是过去式,所以用过去完成时