Question

which choice demonstrates passive voice?
a the waiter apologized to the angry customer.
b a delivery truck just pulled up to the dock.
c the chipped glass was replaced with a new one.
d every day, mechanics check planes before they depart.

Explanation:

Passive voice is formed with the verb "be" + past participle. In option B, "was replaced" follows this structure. Options A and D use active voice (apologized, check). Option C also uses active voice (pulled).

Answer:

B. A chipped glass was replaced with a new one.