单项选择题

In order to make myself ~ in English, I am studying hard.

A．understand
B．understanding
C．to understand
D．understood
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单项选择题
Philosophers believe that desire, hatred and envy are negative emotions which ______the mind and lead it into a pursuit of power and possessions.
A．distort
B．reinforce
C．exert
D．scramble
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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