Question

Complete the sentence using the correct verb form and mark your answer in the response sheet. The life span of certain species ___________ very short.

• A. were
• B. is
• C. are
• D. have been

Answer 1

Answer:

B. is

• The full subject is: The life span

• Even though certain species is plural, it's part of a prepositional phrase (of certain species) and does not affect the verb.

• So the main subject is singular: The life span

• Singular present tense verb — correctly agrees with the subject life span.