I took an online English test, where a question was as follows:
Do you want ___ sandwich or two?
I chose option "a" but it was incorrect. We usually say "do you want a sandwich?", then why was my option incorrect?
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We use a/an before singular countable nouns like cat, dog, sandwich, etc.
However, we use one rather than a/an if we want to emphasize that we are talking about only one thing or person rather than two or more:
- Do you want one sandwich or two.
Therefore, the usage of one is correct here.
Similar examples are:
• Are you staying just one night.
• I just took one look at him and he started laughing.