单项选择题

The workers plan to build a bridge there, ______

A． are they
B． do they
C． don't they
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单项选择题
We must keep the group ______ knowing about the matter.
A． into
B． for
C． from
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
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