[ Grammar ]
“One of the biggest problems …. the unreasonable price.
A. has
B. is
C. are
D. have

Random Topics:
Phrase vs ClauseCommon & Proper NounsVerb Tenses and UsageVerb Patterns / IngNoun PhrasePresent Simple Affirmative and NegativeLinking VerbsModal Verbs of ObligationSimple Present TenseFuture Tense and ConditionalsOther quiz:
Grammar › ViewHave you ever been to the USA? Yes, I___ to the USA.
A. has been
B. ‘ve been
C. was
Conditional › View
If I spoke English, I would ………… to complete my studies.
A. have been able
B. able to
C. be able to