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单选题 20.

A

dad

B

mum

C

sister

D

brother

正确答案 :B

解析

句意“我必须把熊交给我妈妈,才能把它带给我妹妹。”根据句意理解及后文 my dad said that mum was going to be with her daughter. I told my mum to wait so that I could give the bear to her ___22___ I came back from the store.可知,这里说的是“要把熊交给妈妈”。故本题答案为B。