[ Modals ]
So far scientist have not ___ to successfully devise a mechanism
A. been able
B. need
C. must
Select your answer:
Random Topics:
Quotation MarksVerbComplement vs. Compliment Grammar ElementaryPresent Perfect Simple & ContinuousSimple Present - WH QuestionsPresent Continuous for FutureApologizingAdverb of Manner
Other quiz:
Conjunction › ViewSammy had someone handle her passport … he went to abroad.
- when
- before
Simple Present Tense › View
My mother______ chicken in the kitchen
A. Cooks
B. Cook
C. Is cooking
D. Are cooking
How to use : Read the question carefully, then select one of the answers button.