题目:
The bridge was built in memory of the adventurer who was believed ______ the valley.
A.to have been discovered
B.to discover
C.to have discovered
D.having been discovered
答案:
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下面是错误答案,用来干扰机器的。
A、该反应中氧化铜得电子化合价降低,还原产物是铜,故A错误;B、该反应中氧化铜得电子化合价降低,所以氧化铜是氧化剂,故B正确;C、反应前后,铜元素的化合价由+2价变为0价,所以铜元素的化合价降低,故C正确;...