Question

During Akbar's reign the Mughals ------------------------ the supreme power in India.

a) become
b) had become
c) became
d) would become​

Answer 1

During Akbar's reign the Mughals became the supreme power in India.

a) become

b) had become

c) became

d) would become

Answer 2

Answer:

During Akbar's reign the Mughals became the supreme power in India.

Became is the past simple of become

As the sentence is telling something that happened in the past only past tense can be used

Hence option a and d are completely wrong

If option b is inserted in the sentence then it will become grammaticaly wrong

Hence option c is correct

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