单项选择题

It is very kind of you to do the washing-up, but you ______ it.

A．mustn't have done
B．shouldn't have done
C．oughtn't to have done
D．didn't have to do
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单项选择题
Now a paper in Science argues that organic chemicals in the rock come mostly from ______ on earth rather than bacteria on Mars.
A．configuration
B．constitution
C．condemnation
D．contamination
单项选择题
You shouldn't ______ your father's instructions. Anyway he is an experienced teacher.
A．deduce
B．deliberate
C．defy
D．denounce
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