found后面的be动词用什么形式

found后面的be动词用什么形式
比如,：昨天他发现他的钱包丢了.翻译
A.He found his wallet is lost.
B.He found his wallet was lost.
我发现有关found的好多句子,found 后面用的都不是过去式了,
A B 选哪个？还是另有解？