16Hit1600
Standard English ConventionsHardMatched dashes around a supplement

Standard English Conventions practice question

Three of the founders ____ left the company within a year.

Which choice completes the text so that it conforms to the conventions of Standard English?

  1. A. founders — all of them engineers — leftCorrect
  2. B. founders — all of them engineers, left
  3. C. founders, all of them engineers — left
  4. D. founders all of them engineers — left

Answer: A. founders — all of them engineers — left

'all of them engineers' is an aside dropped into the sentence. Opened with a dash, it must be closed with a dash.

Why the other answers are wrong

B. founders — all of them engineers, left
Opened with a dash but closed with a comma — the pair doesn't match.
C. founders, all of them engineers — left
Opened with a comma but closed with a dash. Use the same mark on both sides.
D. founders all of them engineers — left
There's no mark to open the aside, so it reads as one run-on phrase.

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