I wasn't sure whether to laugh or to reciprocate with a remark of my own.

我不知道是该笑一笑还是该说点什么作为回应。

《牛津词典》

"Where is he?" Katia asks, not knowing whether to laugh or not.

“他在哪儿？”卡蒂娅问，她不知道是不是该笑出声。

youdao

My father didn't know whether to laugh or cry, but I suspect he felt some relief.

我父亲不知道是该笑还是该哭，但我猜想他感到了某种宽慰。

youdao

During minute two Baby cried and we went to get him, uncertain whether to laugh or cry.

FORBES: Tim Tebow, Soledad O'Brien and My Not So Pretty Balancing Act

"This one is going to take some time to sink in, walking round the ground seeing family I don't know whether to laugh or cry, it's a really special moment, " said Flintoff.

BBC: Strauss savours famous Ashes win

Add to that his call for a referendum to bring back the franc and to take France out of the European Union, and the mainstream parties are unsure whether to laugh or cry.

ECONOMIST: The French elections