Question

Choose the correct word/phrase to complete each sentence:
I was walking down the street ________ I saw a car crash.

• A. while
• B. when
• C. that
• D. there

Answer 1

The correct option is B when

We use "when" as subordinating conjunction to introduce adverbial clauses of time. It means during the time that and indicates that something is or was happening when something else occurred: the speaker was walking down the street when the crash occurred. Hence, Option B is correct. The rest of the options do not adhere to this rule, hence they're incorrect.