问题补充：
When he got home, he would find his house and he didn’t know to do with the robot.
A. in a mess, how
B. in a mess, what
C. in mess, what
D. at a mess, how
答案：
A. in a mess, how
(答案→)B. in a mess, what
C. in mess, what
D. at a mess, how
解析：in a mess，表示混乱的意思，what···do with，表示对···进行处理，故选答案为
B
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