Lance Armstrong is believed drugs in the past petitive cycling races.
A. to take
B. to be taking
C. to have taken
D. to be taken
网友回答
A. to take
B. to be taking
(答案→)C. to have taken
D. to be taken
解析：句意：兰斯 · 阿姆斯特朗被认为在过去的自行车比赛中服用了违禁药品。be believed to do 的意思是被认为是…….。A. to take不定式的一般式；B. to be taking 不定式的进行式；C. to have taken不定式的完成式； D. to be taken不定式的被动式；由句意可知选C。
考点: 考查动词不定式的用法。