1 When __ a new virus? are the scientists going to test will the scientists test will the scientists have tested are the scientistd testing

The correct answer is "will the scientists test."Explanation: The sentence is asking about a future event, specifically when the scientists will test a new virus. The correct verb tense to use in this context is the future simple tense, which is formed with "will" + base form of the verb. Therefore, "will the scientists test" is the correct choice.