I was doing my homework _______ my mother was doing some sewing.
A．during B．when
C．while D．a(chǎn)fter
C

試題分析：A. during在…期間  B. when當(dāng)…時(shí)候 C. while 當(dāng)…時(shí)候D. after在…之后；句意：當(dāng)我的媽媽在縫衣服的時(shí)候，我正在做家庭作業(yè)。while    當(dāng)…時(shí)候，強(qiáng)調(diào)兩個(gè)動(dòng)詞同時(shí)進(jìn)行，故選C
點(diǎn)評(píng)：when既可以和瞬間動(dòng)詞連用，也可以和延續(xù)性的動(dòng)詞連用，while只能和延續(xù)性的動(dòng)詞連用，同時(shí)while表示兩個(gè)動(dòng)詞同時(shí)進(jìn)行，往往兩個(gè)動(dòng)詞都要用進(jìn)行時(shí)態(tài)的形式。
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