问题
选择题
_________ by the teacher, Tom got into the classroom from the back door quietly.
A．To avoid being seen
B．Avoiding seen
C．Avoid being seen
D．Avoided seeing
答案
答案：A
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_________ by the teacher, Tom got into the classroom from the back door quietly.
A．To avoid being seen
B．Avoiding seen
C．Avoid being seen
D．Avoided seeing
答案：A