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【答案】C;E;A;D;B
【解析】A. Sorry,I can't.对不起,我不能。
B. Thank you,Grandma. 谢谢你,奶奶。
C. Can you help me,Mum?妈妈,你能帮我吗?
D. Who can help me? 谁能帮我?
E. I'm cleaning the room.我正在打扫房间。
(1)根据But I can't find my umbrella.和答语Sorry,I can't.可知询问能不能帮他,故选C。
(2)根据Sorry,I can't. 及上文可知说明正在干事情,故选E。
(3)根据Can you help me,Dad?和I'm watering the flowers.可知做否定回答,故选A。
(4)根据I can help you. 可知询问谁能帮忙,故选D。
(5)根据It's my pleasure.得知上句是表达感谢,故选B。