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【单选题】

This kind of cell phone is very common and I also have ______.

A.
one
B.
it
C.
that
D.
another
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参考解析:
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举一反三

【单选题】Madame Curie is believed _______ radium.

A.
discovering
B.
having discovered
C.
to have discovered
D.
to discover