问题补充：
Mr. Zhang, our math teacher, is strict with students and serious in teaching work, so he .
A. thinks highly of
B. is thought highly
C. is highly thinking
D. is highly thought of
答案：
A. thinks highly of
B. is thought highly
C. is highly thinking
(答案→)D. is highly thought of
解析：句意：张老师，我们的数学老师，对学生非常的严格对教学工作认真，因此他受到了高度赞扬。 think highly of 高度赞扬，它的被动形式highly应放到thought of 之前，所以选D。
