单选题 Jack is good, kind, hard-working and intelligent. ______ ,I can't speak too highly of him.
A. As a result B. By the way C. In a word D. on the contrary

【正确答案】 C
【答案解析】[解析] A．As a result结果；B．By the way顺便；C．In a word总之；D．on the contrary正相反。