I'm very glad to see you.I ( ) you had come already.A.don't know B.haven't know C.didn't know D.hadn't know选什么?为什么?
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I'm very glad to see you.I ( ) you had come already.A.don't know B.haven't know C.didn't know D.hadn't know选什么?为什么?
I'm very glad to see you.I ( ) you had come already.
A.don't know B.haven't know C.didn't know D.hadn't know
选什么?
为什么?
I'm very glad to see you.I ( ) you had come already.A.don't know B.haven't know C.didn't know D.hadn't know选什么?为什么?
c
had come过去完成时 前面就该用一般过去时
选C
后面是HAD COME,所以前面一定是过去时态,而且不可能两个完成时一起用,所以选C.