Question

in 1928, sir alexander fleming made a groundbreaking discovery that would revolutionize medicine: penicillin. while examining a set of bacterial cultures, he ______ that a mold, penicillium notatum, had killed surrounding bacteria. recognizing the mold’s potential, fleming pursued further studies, leading to the development of the world’s first antibiotic. this fortuitous discovery transformed medical treatment, offering a means to combat various bacterial infections and saving countless lives in the process. which choice completes the text so that it conforms to the conventions of standard english? a to notice b will notice c noticing d noticed

Explanation:

El evento ocurrió en 1928, por lo que se usa el pretérito simple en inglés. La opción D ("noticed") es la forma correcta del verbo "notice" en pretérito, ya que la acción de notar la moldura fue en el pasado. Las otras opciones no coinciden con el tiempo verbal apropiado: A es infinitivo, B es futuro, y C es gerundio, lo que no se ajusta al contexto del pasado.

Answer:

D. noticed