单项选择题

There are many kinds of metals, ______.

A．each having its special properties
B．having its special properties
C．one has its special properties
D．each has its special properties
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单项选择题
——How ______ will you finish your homework——In half an hour.
A．soon
B．long
C．often
D．fast
单项选择题
I don't think you've heard of him before, ______
A．don't I
B．do I
C．have you
D．haven't you
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