---I was trying to carry out the plan, but I failed.
---Well, you _________, for we were uncertain it would do ________.
A．needn’t do that, in factB．needn’t have done, in effect
C．needn’t have, in practiceD．needn’t, in time
C
第一空考查needn’t have done“本不必做而做了”，第二空填詞組in practise“實際上”，句意是：--我想實施計劃，但失敗了。--你本不必，因為我不確定是否它會付諸實施。因為上文有動詞carry out，所以needn’t have done后面的done被省略了。選C。
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