【C14】 A. at B. on C. with D. in

【C14】 A. at B. on C. with D. in

To determine the correct preposition, we analyze common usage scenarios for each option:

At typically specifies precise times (e.g., at 9 AM) or small, specific locations (e.g., at the park gate).

On is used for days/dates (e.g., on Monday) or surfaces (e.g., on the table).

With indicates accompaniment, tools, or means (e.g., with a pen, with friends).

In denotes periods (e.g., in 2023), larger locations (e.g., in Paris), or inclusion within a space/context (e.g., in a book).

Assuming a standard context (e.g., time period, location, or abstract concept), in is the most versatile and commonly required preposition for general inclusion or duration.

Answer: D. in

This choice aligns with typical prepositional collocations in English, where "in" frequently expresses containment, time frames, or contextual embedding—scenarios far more common in standard language tests than the narrow use cases of the other options.