[ Tenses ]
I can’t solve that thorny problem until my brother … it to me.
A. explain
B. will explain
C. has explained
D. will be explaining

Random Topics:
Prepositions of Time, Place, and MovementGrammar and ReadingPerfect and Past TensePresent TenseJobsPassive Voice with ModalsVerb BEArticles and DeterminersPast Continuous vs Past SimpleCompound AdjectivesOther quiz:
Vocabulary › ViewScientific help to explore some places and discover more and more remote parts of the world.
A. survey
B. research
C. lead
D. expedition
Some vs. Any › View
The student didn’t make … mistakes on the final exam.
- any
- some
Adverbs › View
The climate is changing ____________ human activity.
A. because
B. because of
Conjunctions › View
In the sentence ‘I will go to the party, but I won’t stay long’, what is ‘but’?
A. Preposition
B. Adverb
C. Coordinating conjunction
D. Subordinating conjunction
