问题

I try to understand __________ that prevents so many Chinese from being as happy as one might expect.

A:why is it
B:what is it
C:why it is
D: what it is

正确答案是：

同类题型

They have________ most carefully the time and money needed to complete the project.

The cost of living in Chengdu is among the lowest in China,________ the quality of life is probably one of thehighest.

Today’s young people can’t live without smart phones.They keep their hands on the phones whenever they go, even whilethey_______meals.

John and I will celebrate our forties weddinganniversary next month.- Oh, _________ !

Do you know sound travels very fast —Yes. But light travels sound.