题目内容
An idea came to her______ she might do the experiment in another way.
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Obviously there was little certainty______ the chairman would agree to this proposal.
I have no idea______ has happened to him.
If you had told me just______ I was to do they would never have found fault with my handling of the case.
______the London Zoo will adopt as a measurement at the critical mement is to try all ways preserving the animals in the zoo.
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