单项选择题

When I try to understand ______that prevents so many Americans from being as happy as one might expect, it seems to me that them are two masons.

A．why it does
B．what it does
C．what it is
D．why it is
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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
______bright was the moon that the flowers were bright as by day.
A．So
B．Such
C．Such a
D．Much
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