She couldn’t understand the lesson __________ her teacher explained it again.
A. unless
B. before
C. because
D. until

Random Topics:
Simple PresentCoherent Sentence with Correct Grammar StructureSingular and Plural NounsAdverbs by TypeTOEICWill vs Verb InfinitivesConjunctions and CommasGerunds and ModalsVerb + PrepositionPassive VoicesOther quiz:
Future Tenses › ViewMatch the sentence with the correct situation:
The Late Show starts in 20 minutes.
A. a timetable or scheduled event
B. a prediction based on our opinion or intuition
C. a plan or decision made at the time of speaking
D. a personal arrangement or fixed plan
E. when there is evidence that something is going to happen
Grammar › View
What ____ when you injured your finger? – I was playing volleyball.
A. did you do
B. were you
C. you did
D. were you doing
Conditional Sentences › ViewIf Sarah __________ (known) about the delay, she __________ (arrive) earlier.
A. had known / might have arrived
B. knew / would arrive
C. knows / could have arrived
D. had known / could arrive
Perfect Tenses › View
I was starving when I arrived home. I ____________ anything for two days.
A. did not eat
B. was not eaten
C. had not eaten
D. have not eaten
