Question

1.chang A for 2.The retired workers were invited to the comp

Answer 1

1.chang A for B是什么意思? 用A来交换B

2.The retired workers were invited to the company,___To their surprise__(令他们惊讶的是)changes had been so great over the years.(to one's surprise, 是某人吃惊的是.)

这句话里面可否填 what surprised them were? 为什么答案上是 to whose surprise?

3.Can you list the country_that River Mekong flows through______(湄公河流经的)(flow through) (或者 through which River Mekong flows)