问题
选择题
He is sweating heavily. He _______ weightlifting for a long time.
A．could have practiced
B．can practice
C．must have practiced
D．might practice
答案
答案：C
题目分析：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。