Question

astronomer____found out that orbit were elliptical​

Answer 1

Answer:

have

Explanation:

astronomers have found out that orbit were elliptical

Answer 2

In the given sentence, "Astronomer____found out that orbit were elliptical." the blank can be filled with 'have'.

• Here, the verb used should be in present perfect tense so as to complete the subject verb agreement.
• Here the subject is 'Astronomers' which is in plural form. So, the verb must also take a plural form as it comes directly after the subject.
• So, finally the complete verb in the sentence is 'have found'.