19. Active: After class, one of the students always erases the chalkboard. (Change into passive
sentence)
a. After class, the chalkboard always is erased by one of the students.
b. After class, the chalkboard was always erased by one of the students.
c. After class, the chalkboard is always erased by one of the students.
d. After class, the chalkboard is always erased with one of the students.
c
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