must have means:
A. Something possibly happened
B. Something was a good idea (but didn’t happen)
C. We are sure about something.

Random Topics:
Relative Clauses and UsagePast Tense & Past Continuous TenseHas Got & Have GotFor vs SinceGrammar and EssayInfinitivesThe Present Progressive TenseCountable & Noncountable NounsVerb-ing or to VerbPast Perfect and Past Perfect Continuous TenseOther quiz:
Vocabulary › View____ children get sick four times as often as children in permanent homes and also suffer from anxiety and depression at a higher rate than stably housed children.
A. Ill-educated
B. Homeless
C. Homely
D. Weak
Grammar › View
Convert the following passive voice sentence to active voice: The letter was written by Sarah.
A. The letter was written by John.
B. The letter was written by the dog.
C. The letter was written by the ocean.
D. Sarah wrote the letter.
Past Tense › ViewIt was the actor Jonhny Depp! he was alone, and I _____to take my chance. So I got up and ____to his table
A. decided/went
B. was deciding/ went
C. was decided/ go
D. decided and was going
Grammar and Vocabulary › View
You ________ cousins in Sweden, don’t you?
A. have to
B. got
C. have
