单项选择题

We must keep the group ______ knowing about the matter.

A． into
B． for
C． from
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单项选择题
He doesn't seem to be able to do it, ______ I thought he could.
A． though
B． since
C． if
单项选择题
When the bell rang, the teacher told the class ______.
A． stop to talk
B． stop talking
C． to stop talking
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