From the words lettered A to D choose the word or group of words that best completes the sentence. If the two boys ... been bit by the snake, they should be...

Answer Details

The correct answer is "have". "If the two boys have been bit by the snake, they should be taken to the hospital" is the correct sentence. "Have" is the correct verb form to use in this context because we are referring to the present perfect tense. The present perfect tense is used to describe an action that started in the past and is still relevant in the present. In this case, we are talking about the possibility that the two boys have been bitten by a snake, and this is still relevant in the present because they may need to be taken to the hospital. Option A "has" is not the correct verb form because it is the present simple tense which does not match with the time reference in the sentence. Option C "had" is also not correct because it is past tense, and the sentence is referring to a possibility in the present. Option D "is" is not correct because it is a present tense form of "be," which does not match with the verb form required in this context.