Question

scientists developed several theories about electricity
a) past perfect
b) simple present
c)present perfect
d) simple past
​

Answer 1

c)present perfect

is the correct answer

Answer 2

Answer:

Simple past

Explanation:

Simple Past Tense Structure is as follow-

Subject+ past form of the verb+ object

Examples-

• They achieved their targets.
• She involved in criminal activities.
• They painted beautiful pictures.
• Ram planned for his trip.
• They completed their homework.
• We distributed sweets among the poor children.
• She worked hard to achieve her dreams.
• I collected my notebooks from the respective subject teachers.

Simple past tense is one of the types of indefinite tense.