【題目】The robot can help Mum _________ when there are dirty clothes.

A. does the washing B. do the washing C. did the washing D. doing the washing

【答案】B

【解析】句意：當有臟衣服時，那個機器人能幫助媽媽洗衣服。do the washing洗衣服，help sb do sth幫助某人做某事，故此處用動詞原形，故選B。

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