问题补充：
Mary couldn’t go to the cinema with us because she had to her little brother.
A. look for
B. look after
C. look at
D. look into
答案：
A. look for
(答案→)B. look after
C. look at
D. look into
解析：A. look for寻找B. look after 照顾 C. look at看一看D. look into调查；句意：玛丽不能和我们去电影院因为她要照顾她的小弟弟。故选B.
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