Question

One of the men.......(is,are,have been,had been) walking at night

Answer 1

Answer:

One of the men is walking on the road.

Explanation:

Because,when one of the stands in any sentence the noun agrees with plural but verb will be singular.one of the means particular person/material in a group.ex:one of the students is ill in the class.here 1student is ill not all the students.

Answer 2

Answer:

had been

Explanation:

One man is the subject, so auxiliary verb will be singular. Only is and had been are singular here. 'Is' is used for present only, But here we are talking about night time, so had been will be perfect option.