单项选择题

I'll tell you the secret, but（）you don't tell anyone else about it.

A．only if
B．if only
C．even if
D．if not

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单项选择题
Very little（）they had made an important discovery in science.

A．they realized
B．they realized what
C．did they realize
D．did they realize what
单项选择题
The American Red Cross is one of the volunteer organizations（）purpose is to help the sick and the needy.

A．its
B．that
C．who
D．whose
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