They __________ (could / must) have taken the wrong train. ... | GrammarQuiz.Net

[ Modal Verbs ]

They __________ (could / must) have taken the wrong train.

A. must

B. will

C. could

D. can

Select your answer:
A B C D E

Random Topics:

Modals, Phrasal Verbs, Gerunds and Infinitives Clause Markers TOEFL Grammar Second and Third Conditional Ability Have to/Has to Hope, Thank, Modal Verbs Adverbial Clauses of Manner and Result Relative Clauses with who and which Present Perfect and Present Perfect Progressive Tenses Simple Compound and Complex Sentences

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