<p dir="ltr"><span><span>This question is a simple sentence following the pattern: S + V, and the blank should be filled with a verb. </span></span></p><p dir="ltr"><span><span>(D) "arrive" is eliminated since the subject “the train” is singular and can’t be followed by a plural verb “arrive.”</span></span></p><p>The other three choices are possible answers, and the key to identifying the correct answer is to figure out the tense. Judging from the words “unlike the local, which is always late,” the context should be telling about a fact that happens all the time, instead of something that is currently happening or has been happening until now. <br></p><p>Thus, the correct answer should be a verb in the simple present tense, that is, (C) "arrives". </p><p>(A) "is arriving" is incorrect since it is the present continuous tense </p><p>(B) "has been arriving" is incorrect since it is the present perfect continuous tense. </p>