I was impressed____subways my first time in Europe.

I was impressed____subways my first time in Europe.

• A. At
• B. With
• C. To
• D. By

Answer: (D)

The statement uses the natural pattern be impressed by something: the preposition “by” introduces the source of the impression. Here, the speaker is saying what caused their admiration during their first trip to Europe—the subways. Other prepositions don’t fit this idiomatic structure: “at” would point to a moment or place rather than the source, “to” isn’t used in this context, and “with” sounds like you’re impressed with someone’s qualities or performance rather than what caused the impression. So the best fit is “by.”

The statement uses the natural pattern be impressed by something: the preposition “by” introduces the source of the impression. Here, the speaker is saying what caused their admiration during their first trip to Europe—the subways. Other prepositions don’t fit this idiomatic structure: “at” would point to a moment or place rather than the source, “to” isn’t used in this context, and “with” sounds like you’re impressed with someone’s qualities or performance rather than what caused the impression. So the best fit is “by.”