Mike is kind, determined and full of energy. ，I can't speak too highly of him.
AAs a result
BIn a word
CBy the way
DOn the contrary
网友回答
A. As a result
(答案→)B. In a word
C. By the way
D. On the contrary
解析：句意，Mike善良,聪明,又刻苦努力。总而言之,再怎么赞扬都不过分。can't do sth too+adv. 这个句型意义为: 再...也不过分,简直太...! As a result 结果 In a word总而言之
By the way 顺便地 On the contrary 正相反，根据题意，故选B。