问题补充：
----Who’s the man sitting under the tree? ----I don this man, but I’ve him.
A. know of, heard about
B. know, heard about
C. know, heard
D. know of, heard
答案：
A. know of, heard about
(答案→)B. know, heard about
C. know, heard
D. know of, heard
解析：know 意思是:知道,了解; hear about意为:听说 ; hear意为:听见.
