when I try to understand___it is that prevents so manyAmericans f_英语解答

when I try to understand___it is that prevents so many
Americans from being as happy as one might expect,it seems to me___there are quite a few causes.A why ;that B which ;as C what ;that D whether ;since

人气：195 ℃　时间：2019-08-21 20:28:25

解答

C 当我试图去理解是什么阻挡了许多美国人得到他们应有
的快乐时,我发现个中原因实在不少.
what it is that prevents...
that 跟随what it is,概括阻挡美国人得到快乐的原
因.这里不能用why,因为why prevents说不通,而
what prevents就没有问题.