问题
选择题
—Tom must be at home because the light in his house is on.
—He ____ be at home, because I saw him playing basketball on the playground.
A. can B. mustn’t C. can’t
答案
答案：C
题目分析：can能，mustn’t禁止，can’t不能。句意：汤姆一定在家，因为他家的灯亮着。他不能在家，因为我看见他正在操场打篮球。故选C。