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Almost all metals are good conductors(导体), silver _______ the best conductor of all.
A. been B. being C. is D. to be
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______that silver is not widely used as a conductor(导体)?
A. Why is B. Is it why C. Why is it D. Why it is
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________ that silver is not widely used as a conductor(导体)?
Why is
Is it why
Why is it
Why it is
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