题目内容
I ________ Doctor White but I don’t ________ him.
[ ]
A.have heard; hear
B.have known; hear
C.have known about; know
D.have heard about; know about
答案:C
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题目内容
I ________ Doctor White but I don’t ________ him.
A.have heard; hear
B.have known; hear
C.have known about; know
D.have heard about; know about