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

Other quiz:

Grammar › View

I wouldn’t have to take this course if my English ____ better.
A. were
B. had been
C. would be
D. would have been

Modal Verbs › View

She __________ have completed the assignment; it was due yesterday.

A. might

B. could

C. should

D. must

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