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_________ did the students realize that they were mistaken about spiders.

A. It was until then                                                                    B. It was not until then

C. Not until then                                                                         D. Not until when

_________ did the students realize that they were mistaken about spiders.

A. It was until then                                                  B. It was not until then

C. Not until then                                                     D. Not until when