Question

1. Choose the correct interrogative sentence A) When were potatoes introduced into Japan? B) When was potatoes introduced into Japan?C) When were introduced potatoes into Japan?D) When did they introduced potatoes into Japan? E) When they introduced potatoes into Japan?​

Answer 1

A) When were potatoes introduced into Japan?

Answer 2

The correct interrogative sentence is:

A) When were potatoes introduced into Japan?