Hadi looks very tired, he ___for hours.
B. had driven
C. has been driving
D. had been driving
Regular vs. Irregular Verb Farther vs. Further Regular VerbFuture TenseConditionals / Unreal PastMix-TensesGrammar (either..or.. and neither..nor..)Grammar and EssayQuantifiers Mix
Other quiz: Subject-Verb Agreement
Some research ___ that Vitamin C may help prevent cancer.
How to use : Read the question carefully, then select one of the answers button.