A notice says: 'Visitors must register at the counter before entering.' What must visitors do?

Answer and explanation

Correct answer: D. Sign in first before going in

'Must' shows an obligation and 'before entering' sets the order.
Answer: Sign in first before going in.
Why not the others: Enter first and register afterwards: the rule says before entering. Register only if they stay overnight: no such exception is given. Show identity only when asked: registration is required for all visitors.

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