Choose the best option to complete the sentence. The train ____ yet. We can have a quick cup of coffee. 

Because the sentence's general tense is present perfect, option A 'hasn't arrived' is the right response. This choice makes appropriate in this context because they are still waiting for the train to arrive at their location.

Option B and D are also grammatically wrong for this sentence.

To be complete, the statement requires a phrase in the present perfect tense. Option C, "isn't arriving," is in the present continuous tense and so erroneous.

The present perfect tense is used to describe actions that have already occurred at a certain moment. It uses the primary verb, verb + ed, with an auxiliary verb and past participle. I have previously viewed this movie, and He has finished his homework are two examples of the present perfect tense.