单项选择题


A．failed
B．dropped
C．fallen
D．missed
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单项选择题
We can hardly avoid making any mistakes in our work ______ hard we try.
A．whatever
B．how
C．no matter
D．however
单项选择题
A．essentialB．elementaryC．necessaryD．principal
A．essential
B．elementary
C．necessary
D．principal
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