The club's amplification system needed to be adjusted continually

a. past perfect in the passive voice
b. past continuous in the passive voice
c. an infinitive in a passive voice.
d. simple past in the passive voice
Answer c.

right

To determine the correct answer, let's break down the sentence and analyze the different verb forms used.

"The club's amplification system needed to be adjusted continually."

The main verb in this sentence is "needed." It is in the past tense, indicating that the action occurred in the past. The subject of the sentence is "The club's amplification system."

Now let's look at the phrase "to be adjusted." This is an infinitive verb phrase. In this sentence, it functions as the passive voice of the verb "adjust." The active voice form would be "needed to adjust the club's amplification system continually." But since the sentence focuses on the amplification system being adjusted rather than who is doing the action, the passive voice form is used.

The correct answer is therefore c. "An infinitive in the passive voice."