He is sweating heavily. He weightlifting for a long time.
A. could have practiced
B. can practice
C. must have practiced
D. might practice
网友回答
A. could have practiced
B. can practice
(答案→)C. must have practiced
D. might practice
解析：考查情态动词。根据第一句内容可知，这是对过去的肯定推测。句意：他流了很多汗。他肯定已经练习举重很长时间了。故C正确。