题目内容

Mum ________ clothes, so I have to look after my younger sister.
A．washesB．is washingC．washedD．was washing
B

试题分析：句意：妈妈正在洗衣服，所以我不得不照顾我的小妹妹。根据答语我不得不照顾我的小妹妹可知我的妈妈正在洗衣服，所以应用现在进行时，be+doing sth的形式，故选B。
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