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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单项选择题
Some companies have introduced flexible working time with less emphasis on pressure ______.
A．than more on efficiency
B．and more on efficiency
C．and more efficiency
D．than efficiency
单项选择题
He would never forget the hardships he witnessed during the Great ______ of the 1930s.
A．Unemployment
B．Starvation
C．Depression
D．Renaissance
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