问题

What is ________ at all is _____ well.
A:worth doing ; worthy to be done
B:worthy doing ; worth to be done
C:worth being done ; worth of being done
D:worthy of being done ; worthy doing;
B:worthy doing ; worth to be done
C:worth being done ; worth of being done
D:worthy of being done ; worthy doing;
正确答案是:
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