You can now go to the departure lounge. If you are on an international flight, your passport __(24)__, ?
Explanation
This structure uses the passive voice, which is appropriate here because the focus is on the action being done to the passport rather than on who is performing the action. In formal language, especially in contexts like air travel, it's common to use the passive voice to emphasize procedures and regulations.
The sentence implies that there is a requirement for passports to be reviewed or validated as part of the check-in process for international flights, which involves security checks and immigration processes. Therefore, "is checked" indicates that the passport will be subject to this action.
Choosing "check" (A) or "checked" (B) would not fit grammatically or contextually in this sentence; "is checking" (C) implies a continuous action that doesn't suit the requirement in question. Thus, "is checked" effectively communicates that the passport undergoes inspection as an established procedure for international travelers.
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