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