7. When I try to understand        that prevents so many Americans from being as happy as one might expect,it seems to me that there are two causes (be)

當我試圖去了解為什么如此多的美國人不能與想象中的那樣幸福時，我認為有兩個原因。

7. what it is understand后跟的是一個賓語從句，從句應(yīng)用陳述語序;從句里又含有一個強調(diào)句型。

題目來源：高考英語組合訓練多項選擇+完成句子 > 組合訓練37-38

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