[ 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:
Random Topics:
If vs. WhetherClick vs. Clique Simple Past Future Tense Conditional Sentence Type 0-3Adjectives & PrepositionState Verbs and Action VerbsPast Simple VerbsGerund or to InfinitivePresent Progressive
Other quiz:
Tenses › ViewI think humans … on Mars one day.
A. are going to live
B. will live
C. live
Grammar › View
You __?__ study for the test.
A. better
B. had better
How to use : Read the question carefully, then select one of the answers button.