9.Circle the verb Form of the interrupted action in each sentence.
A. american engineer Wilson Greatbatch was working on a gadget when he inserted the wrong type of resistor into his invention.
B.Dr.HarryCoover discovered superglue in 1942 when he was trying to isolate a clear plastic to make precision gun sights.
C. Coover was working in a Tennessee chemical company when he realized the potential of the substance
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A) when he inserted
B) he was trying
C) when he realized
B) he was trying
C) when he realized
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