The Great Wall of China ______ which stretches over 13,000 miles, was constructed over the course of nearly two millennia.
Which choice completes the text so that it conforms to the conventions of Standard English?
- A
:
- B
;
- Ccheck_circle
,
- D
(empty)
Explanation
"Which stretches over 13,000 miles" is nonrestrictive (the Great Wall is uniquely identified) and must be set off by paired commas; the closing comma already exists, so the opening comma is needed.