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
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单项选择题
A．essentialB．elementaryC．necessaryD．principal
A．essential
B．elementary
C．necessary
D．principal
单项选择题
Tom said that he wouldn't mind ______ .
A．to wait for us
B．waiting for us
C．wait for us
D．for waiting us
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