单项选择题

If I see the twin brothers apart I don't know______.

A. who is who
B. who is whom
C. which is which
D. what is what
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He would never forget the hardships he witnessed during the Great ______ of the 1930s.
A. Unemployment
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C. Depression
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The ______ of AIDS has led to an expansion in research seeking a cure.
A. innovation
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