xx learned to his astonishment that they were from North Korea.这句话里“learn to"是何意?

题目

xx learned to his astonishment that they were from North Korea.这句话里“learn to"是何意?

答案

to his astonishment “使他惊讶的是.”如果像这样放在句子中间,前后应该有逗号与句子分开,它一般置于句首.即：
To his astonishment,xx learned that they were from North Korea.
使XX惊讶的是,他得知他们是北朝鲜的.