The sentence structure in the given question uses an example of inversion typically found with negative adverbials like "hardly," which sets up a specific relationship between the clauses of the sentence. In this context, the sentence adheres to the pattern "Hardly had [action] when [result]." This pattern is used to convey that one action is quickly followed by another.
The sentence, "Hardly had the train arrived ________ the passengers rushed to board," seeks to create this relationship of immediate succession.
Let's evaluate the options:
Thus, the correct completion is the word 'when'.
Complete the sentence:
"The team faced the challenge ___________ confidence, leading to their success.''
Complete the sentence:
"The proposal was accepted ___________ reluctance.''
Complete the sentence:
"Her ________ approach to solving problems impressed her colleagues.''
Choose the option that best completes the sentence:
"If I _________ enough money, I would buy a new car.''