, it began to run unexpectedly . A. While he was cleaning the machine B. While cleanin——青夏教育精英家教网—

摘要： , it began to run unexpectedly . A. While he was cleaning the machine B. While cleaning the machine C. To clean the machine D. He was cleaning the machine

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______, it began to run unexpectedly.

　　A. While cleaning the machine B. To clean the machine

　　C. He was cleaning the machine D. While he was cleaning the machine

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________, it began to run unexpectedly.

[　　]

A．While he was cleaning the machine

B．While cleaning the machine

C．To clean the machine

D．He was cleaning the machine

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