The answer key was "Certainly"? " to mean "You have got to be kidding! "
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Grammar GeekSo in the movie "Airplane" that whole "And stop calling me Shirley" isn't as funny to you, is it.Yes it is. We use it in that sense, not normally in the 'definitely' sense.
Grammar GeekWhew. So we agree that it should be "Surely" in that sentence?Yes
Aspara GusEither certainly or surely can be used in the sentence. If your source says only one is acceptable, then you need a new source.Now that I have corrected my original misreading, I think that 'certainly' is most unlikely here.