题目内容
________, 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
答案:A
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题目内容
________, 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