单项选择题

His children are well-behaved, ______ those of his sister's are very naughty.

A．and
B．so
C．thus
D．while
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单项选择题
You have failed two tests. You'd better start working harder, ______ you won't pass the course.
A．and
B．but
C．or
D．so
单项选择题
By no means ______ to her parents.
A．this is the first time has she lied
B．this is the first time does she tell a lie
C．is this the first time she has lied
D．is this the first time she was lying
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