Question

1. los profesores ______ en la biblioteca.

○ estoy
○ estás
○ está
● están

Explanation:

The subject "los profesores" is plural (third - person plural in Spanish). The verb "estar" has the following conjugations: "estoy" (first - person singular), "estás" (second - person singular), "está" (third - person singular), and "están" (third - person plural). So, we need to use the third - person plural form of "estar" to match the subject "los profesores".

Answer:

D. están (assuming the options are labeled A - D with A. estoy, B. estás, C. está, D. están)