问题补充：
I her, but I her.
A. know; don’t hear of
B. hear; don’t know
C. have known; haven’t heard of
D. have heard of; don’t know
答案：
A. know; don’t hear of
B. hear; don’t know
C. have known; haven’t heard of
(答案→)D. have heard of; don’t know
解析： hear of 听说；know认识。
