When Jim’s mother came in, he _______ his homework.
A．is doing    B．has done   C．was doing
C
句意：當(dāng)吉姆的母親進(jìn)來時(shí)，他正在做他的作業(yè)。結(jié)合語境可知本句描述是的是過去某時(shí)正在進(jìn)行的動(dòng)作，故用過去進(jìn)行時(shí)態(tài)。選Ｃ。
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