问题
选择题
If a thing is worth ______, it must be well ______.
A．doing; done
B．to do; doing
C．to do; done
D．being done; doing
答案
答案：A
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If a thing is worth ______, it must be well ______.
A．doing; done
B．to do; doing
C．to do; done
D．being done; doing
答案：A