I haven’t finished my homework yet. I      my mother with the housework all day yesterday.
A．helpedB．have helpedC．was helpingD．have been helping
C

試題分析：考查時(shí)態(tài)。本題的關(guān)鍵詞是all day yesterday,指在昨天一天的時(shí)間里一直在做的事情，故使用過(guò)去進(jìn)行時(shí)。過(guò)去進(jìn)行時(shí)既可以表示在過(guò)去的時(shí)間點(diǎn)，或者過(guò)去的一段時(shí)間里發(fā)生的事情，或者持續(xù)的狀態(tài)。句意：我還沒有完成我的家庭作業(yè)。昨天一天我都在幫助我媽媽做家務(wù)。故C正確。
點(diǎn)評(píng)：時(shí)態(tài)的考查要根據(jù)關(guān)鍵詞和語(yǔ)境的辨析。本題關(guān)鍵詞是all day yesterday.
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