单项选择题

A．90% copper and 10% silver.
B．90% silver and 10% copper.
C．90% silver, 9% copper, and 1% lead.
D．None of these.
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单项选择题
A．Mary earned the prize.B．Mary has granted the prize.C．Mary fails in the speech contest.D．Mary shouldn’’t earn the prize.
A．Mary earned the prize.
B．Mary has granted the prize.
C．Mary fails in the speech contest.
D．Mary shouldn’’t earn the prize.
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