我太惊讶了，不知道该如何回答。

I was so amazed that I didn't know how to answer.

youdao

他的劝说和解的态度立刻消失了，他迅速转入守势，可是一时间不知道该如何回答。

In an instant his persuasive, conciliatory manner fled. He was on the defensive at a wink and puzzled for a word to reply.

youdao