No one knows exactly who were the first Americans, but ...

[ Modal Verbs ]

No one knows exactly who were the first Americans, but scientists exploring caves have found evidence that they _____ from Asia.

A. should have arrived

B. would have arrived

C. must have arrived

D. ought to have arrived

E. have arrived

Select your answer:
A B C D E

Random Topics:

Linking Verb Phrasal Verbs Modal Adjectives and Degrees Passive Voice, Question Tag, Prepositions Tenses Structure Gerunds and Infinitives Types of Preposition Auxiliary and Modal Verbs Grammar of Conjunctions and Prepotitions

Other quiz:

Grammar › View

What type of word is the underlined word in the following sentence:
Today, my mother and I are going to the park after school.

    A.     Noun
    B.     Pronoun
    C.     Verb
    D.     Adverb
    E.     Interjection

Modal Verbs › View

You ___ play loud music after 10 p.m.

A. should

B. must

C. could

D. had to

E. mustn`t

Tenses › View

What I …………….. is that we …………….. to think seriously about a thorough reform in the legal system

A. have proposed / should have begun

B. had proposed / were beginning

C. am proposing / begin

D. was proposing / have begun

Vocabulary › View

I cant give up and let go my hard work in ___________.

A. drain

B. vain