“我茫然了”用英语怎么说？

There's something fishy going on here.

这里面有些事不太对劲。

That's strange. He was here a minute ago.

真奇怪!他刚才还在这儿呢!

I heard a weird noise.

我听见有奇怪的声音。

I feel puzzled.

我茫然了。