The boy was doing homework while his mother      dinner.
A．cooksB．cookedC．was cookingD．will cook
C
本題的含義為當(dāng)男孩的母親正在做飯時，男孩正在做家庭作業(yè)，while引導(dǎo)的時間狀語從句，和主句時態(tài)要保持一致，本題從句應(yīng)該使用過去進(jìn)行時，故本題選C。
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