单项选择题

How can you keep fit ______ you smoke so much every day

A．but
B．however
C．if
D．otherwise
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单项选择题
The news has spread allover the country ______ the spaceship succeeded in returning to the earth.
A．what
B．that
C．which
D．whether
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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