A therme is contrasting concepts in a text
Answer:
Held Up
Explanation: If we take each option and place it in the blank of the sentence, we can see which one makes the most sense.
A. The train was <em>held back</em> by a heavy snowfall.
B. The train was <em>held out </em>by a heavy snowfall.
C. The train was <em>held off </em>by a heavy snowfall.
D. The train was <u>held up</u> by a heavy snowfall.
Ms. Garcia was leading a tour of the gallery when the fire alarm sounded.
This is correct because it is the only sentence where the verbs match tenses.
That is the best book that I ( have read )on that subject.
reason = because that event has already happend in past but its impact is still on present so it is past perfect..........