I'm wondering why she did this.

我想知道她为什么这么做。

youdao

And I'm wondering why I've waited so long.

想知道是什么驱使我长久的等待。

youdao

I'm wondering why I miss him so much.......

我感到纳闷，为什么我这么想念他。

youdao

I'm left wondering why I have turned against it in the new RX 350 F Sport.

WSJ: 2013 Lexus RX 350 F Sport Review: Dashed on the Rocks of the Lexus Dash | Rumble Seat by Dan Neil

"I'm just wondering why a yogurt is more dangerous than a penknife or a golf club, " she said.

WSJ: New TSA rules on knives draw fire from 9/11 kin

Well, I'm wondering, why hasn't she used him before, because he is enormously popular out on the campaign trial?

NPR: Early Hurdles for Clinton, McCain?