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Difficulty: EasyModal Auxiliaries and Expressing Modality

Before entering the high-containment biohazard laboratory, all visiting researchers _____ sign the visitor logbook and wear full protective gear as mandated by safety regulations. Which of the following modal options correctly completes the sentence to express formal obligation?

  1. mustAnswer
  2. B
    must to
  3. C
    might can
  4. D
    oughted to

Answer

The modal auxiliary 'must' correctly completes the sentence to express formal obligation.
The modal verb 'must' accurately conveys mandatory obligation required by official regulations and correctly precedes the bare infinitive 'sign'.

Step-by-Step Solution

1
Identify the required semantic meaning from the context.
The phrase 'as mandated by safety regulations' indicates a compulsory requirement, calling for a modal of strong obligation.
Mandated rules require a modal expressing necessity or obligation.
2
Determine the correct syntactic structure for the verb phrase.
The verb 'sign' is a bare infinitive, which requires a standard modal auxiliary without 'to' or additional inflections.
Modal auxiliaries are directly followed by the base form of the main verb.
3
Select the option that meets both semantic and grammatical criteria.
'must' fits both the meaning of mandatory obligation and the required bare infinitive structure.
'must' is uninflected and pairs directly with 'sign'.

Key Concept

Modal Auxiliaries and Expressing Modality
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Topics

Modal Auxiliaries and Expressing Modality

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