The investigated was ongoing, but my guess was that it ...

[ Modal Verbs ]

The investigated was ongoing, but my guess was that it … one of the staff who had stolen the money.

A. must be

B. must have been

C. could be

D. could have been

Select your answer:

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Speech Tenses Simple Past - Irregular Verbs Prepositions and Adverbs Past Simple Conditional Sentences and Verb Form Auxiliary Verbs, if, unless and Modal Passive Sentence For vs Since Gerunds as objects of preposition

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