HE BEHAVED IN A VERY STRANGE WAY. THAT SURPRISED ME A LOT.A.I WAS A...

20.

He behaved in a very strange way. That surprised me a lot.

A.

I was almost not surprised by his strange behaviour.

B.

He behaved very strangely, which surprised me very much.

C.

What almost surprised me was the strange way he behaved.

D.

His behaviour was a very strange thing, that surprised me most.