【题目】It's certainly hard work. But, a man who wishes to have a career has to make a great many sacrifices.
A.on the contrary
B.in addition
C.on the other hand
D.in that case

【答案】C
【解析】这题考查词组辨析：on the contrary正相反，in addition此外，on the other hand另一方面，in that case在那种情况下，句意是：这是很辛苦的，但另一方面一个想要有事业的人不得不做出很多的牺牲。选C。