Gold (can combined) with silver (in any) proportion, but alloys with 50 (to) 60 percent silver are (the strongest).

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问题 Gold (can combined) with silver (in any) proportion, but alloys with 50 (to) 60 percent silver are (the strongest).

选项 A、can combined
B、in any
C、to
D、the strongest

答案A

解析
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