[ Tenses ]
Up to the present, they (understand) what life is.
A. had understood
B. have understood
C. were understanding
D. are understanding

Random Topics:
Grammar (either..or.. and neither..nor..)Linking VerbSimple Future - WillTenses and ArticleSimple present/ past/ future tenseContrastive ConjunctionGrammar - could / could notVocabulary and DefinitionsGrammar - Present Perfect with already, just, yetGrammar - to beOther quiz:
Grammar › ViewIrene: Have you ever eaten pizza for breakfast?
Alex: No, I ______.
A. haven’t
B. have
C. hasn’t
Grammar › View
The gardener ________ the plants this morning.
A. water
B. waters
C. watering
D. watered
Grammar › ViewThe festival, ______________ lasted all day, ended with a banquet.
A. that
B. who
C. which
D. whose
Modals › View
My girlfriend is expecting me at 8 p.m. I … be late!
A. mustn’t
B. don’t have to
C. have to
D. must