on September 12 1917 the Soviet space exploration program Luna 16 ____
a) launched b) is launching c) has launched d) was launched

Question

on September 12 1917 the Soviet space exploration program Luna 16
____
a) launched b) is launching c) has launched d) was launched

Akanksha Arora · Accepted Answer

Solution:
The correct answer is option (d) was launched
Explanation: In this sentence the action was performed in the
past and it is already complete, therefore simple past tense is
used

on September 12 1917 the Soviet space exploration program Luna 16 ____ a) launched b) is launching c) has launched d) was launched

on September 12 1917 the Soviet space exploration program Luna 16 ____
a) launched b) is launching c) has launched d) was launched