they knew each other before什么意思
They________eachotherbefore.A.knowB.knewC.haveknownD.hadknown...
They ________ each other before.
A. know
B. knew
C. have known
D. had known 展开
A. know
B. knew
C. have known
D. had known 展开
推荐律师服务：
若未解决您的问题，请您详细描述您的问题，通过百度律临进行免费专业咨询
