单项选择题

To know what is good and（）are two different things.

A. doing what is right
B. to do what be right
C. did what was right
D. to do what is right

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单项选择题

At the beginning he refused to take any responsibility but he had to end up by（）

A. to apologize
B. apologizing
C. apologized
D. apologize

单项选择题

With the development of artificial intelligence, robots will do some mental work in office（）some manual work on the production line.

A. in addition
B. except
C. as well as
D. as well

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