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МатематикаВопрос:
2. It ... have been John who answered the phone last night; I know there was no one else home.
Ответ:
Краткое пояснение:
The sentence expresses a strong assumption about a past event where John answered the phone. The modal verb 'must' followed by 'have' and the past participle is used to express a high degree of certainty about a past action.
Варианты ответа:
- a) must
- b) can
- c) may
Ответ: a) must
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