They think some treasure ___ in the ceve .

问题描述:

They think some treasure ___ in the ceve .
A have been found
B is finding
C has been found
D was finding
请翻译句子和选项
并加以说明原因

答案选C
翻译:他们认为在洞穴里找到了一些珍宝.
首先Treasure是不能find“找”的,只能be found“被找到”,排出BD
然后Treasure是单数,不能用A