One of my teachers ____ from Japan.

The subject 'One' is singular and requires a singular verb in the present tense. The correct verb form is 'comes'.

Option A ('come') is incorrect because it is the base form and does not agree with a singular subject in the present tense.

Option C ('coming') is incorrect because it is a present participle and cannot function as the main verb without an auxiliary verb like 'is'.

Option D ('came') is incorrect because it is past tense, but the sentence implies a general truth or habitual action, which requires present tense.