--- Where is Jack? I can’t find him anywhere.
--- He ______ his homework upstairs.
A．might have done B．must have doneC．might be doingD．must do
C
本題考查情態(tài)動(dòng)詞表猜測(cè)的用法。結(jié)合語(yǔ)境Where is Jack?可知說(shuō)話人想知道Jack現(xiàn)在在哪，談?wù)摰氖乾F(xiàn)在的事，排除AB; “在樓上做作業(yè)”應(yīng)是正在進(jìn)行，排除D。
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