7.
Your Answer is
Correct Answer is B
Explanation
from a distance is a sentence interjection, separated by double commas. This question is solved by the method of elimination, from a distance is a fixed collocation, there is no symbol in the middle, and D is wrong.
Like a giant shell as a whole, item C is wrong.
A item from a distance like a giant shell is placed at the end of the sentence as a whole, and it can only be a sentence adverbial. There should be no comma at the end of the sentence, so item A is wrong.
Note: If there is an unsigned option for this question, it is also acceptable.