Question

In the 1850s, Hong Kong ... a population of only 33,000
Вместо пропусков вставьте 1 слово
1)had
2)was having
3)has
4)have

Answer 1

In the 1850s, Hong Kong has a population of only 33,000

Answer 2

In the 1850s, Hong Kong had a population of only 33,000
Так как это происходило в 1850, то есть в прошлом, значит глагол had 3 формы прошедшего времени.