People have come to understand _____ prevents so many Americans from  being as happy as one might expect.
A.that it is whyB.what does it thatC.why it does thatD.what it is that
D

試題分析:考查強調句型。本題考查的強調句型的特殊疑問句轉換而成的賓語從句,任何一個賓語從句都使用陳述語序。本題強調的句子是主語,然后對主語進行提問。句意:人們逐漸地知道究竟是什么阻止如此多的美國人不如人們所預料的那么開心。故D正確。
點評:強調句型的基本結構為It is/was被強調成分that/who其它成分;其最大的特點就是去掉it is/was…that/who…句子仍然成立。要注意強調句型能強調除謂語動詞以為的所有的句子成分。在考查的時候,經(jīng)常會把強調句型和定語從句結合在一起考查,要注意分析句子的成分。要注意強調句型的一般疑問句和特殊疑問句的考查。
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