Question

--- 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

Answer 1

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。