问题
选择题
--- Where is Jack? I can’t find him anywhere.
--- He ______ his homework upstairs.
A．might have done
B．must have done
C．might be doing
D．must do
答案
答案：C
本题考查情态动词表猜测的用法。结合语境Where is Jack?可知说话人想知道Jack现在在哪，谈论的是现在的事，排除AB; “在楼上做作业”应是正在进行，排除D。