Question

用適當(dāng)?shù)脑~填空

1. I just don’t understand what it is         prevents so many Americans

from being as happy as one might expect.

Answer 1

 1. that考査賓語(yǔ)從句中強(qiáng)調(diào)句的使用。原句可改為：…it is what that prevents so many Americans …英語(yǔ)中疑問(wèn)代詞或副詞要放在句首。