Choose the correct word: It is ___ that all visitors sign in at reception.
Answer and explanation
Correct answer: C. mandatory
'Mandatory' means required by a rule.
Answer: mandatory.
Why not the others: optional: it means not required. temporary: it means short-lasting. unlikely: it means improbable.
Answer: mandatory.
Why not the others: optional: it means not required. temporary: it means short-lasting. unlikely: it means improbable.
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