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Difficulty: Very hardModal Auxiliaries and Expressing Modality

Given that the lead researcher was stranded at the airport without internet access throughout the evening, she __________ the confidential report yesterday as claimed. Which of the following modal expressions correctly completes the sentence to express logical impossibility regarding a past event?

  1. could not have submittedAnswer
  2. B
    might not can submit
  3. C
    must not submit
  4. D
    ought not to submitted

Answer

The expression 'could not have submitted' is the correct modal construction to express logical impossibility regarding a past action.
The modal phrase 'could not have submitted' correctly pairs the negative modal auxiliary 'could not' with the perfective helper 'have' and the past participle 'submitted'. This structure standardly conveys a logical deduction that a past event was impossible.

Step-by-Step Solution

1
Analyze the temporal context and the speaker's intent.
The context describes a completed past situation ('yesterday', 'was stranded') where an action was factually impossible.
Modal auxiliaries expressing past logical deduction or negative certainty require past modal structures (modal + have + past participle).
2
Determine the appropriate modal auxiliary for past logical impossibility.
'Could not have' + past participle is used to deduce that a past action was impossible given the circumstances.
Expressing that something definitely did not happen due to surrounding evidence requires negative past epistemic modality.
3
Evaluate the choices for grammatical validity.
'Could not have submitted' is syntactically sound, while other options contain double modals, tense mismatch, or improper verb inflections.
English syntax forbids double central modals ('might can') and requires correct aspectual forms after modal markers.

Key Concept

Modal Auxiliaries for Past Logical Deduction and Impossibility
Estimated Time:1m 15s
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Topics

Modal Auxiliaries and Expressing Modality

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