单项选择题

They will be very thankful for ______ you can give them.

A．that
B．which
C．when
D．whatever
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单项选择题
______ some mammals came to live in the sea is not known.
A．Which only
B．Since
C．Although
D．How
单项选择题
One should always remember that appearances can be ______ .
A．wrong
B．mistaken
C．incorrect
D．false
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