问题
选择题
During the class, Tom slipped out of the classroom ____the back door so as not to be found by the teacher.
A．across
B．in
C．by
D．beside
答案
答案：C
介词辨析。By表示方法和手段，意为：通过；结合句意可知C正确。句意：在上课期间，Tom从后面溜出教室，以免被发现。
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