[ Modal Verbs ]
Scientists fear that a patient’s immune system _____ stem cells unless they _____ genetically identical to the patient’s other cells.
A. may reject / are
B. may have rejected / were
C. could reject / had been
D. has rejected / has been
E. would be rejected / were
Random Topics:
TimePrepositions after Verbs and AdjectiveModals and Semi-ModalsGiving and Asking for AbilityPrepositions and ArticlesZero & First ContidionalHas and HaveGerunds as Objects of PrepositionsWill vs Verb InfinitivesConjunctionsOther quiz:
Grammar › ViewIdentify the verb in this sentence:
The lost child looked scared.
A. lost
B. looked
C. child
D. scared
Grammar › View
Sally likes playing football. _____ likes playing online games too.
A. He
B. She
C. It
D. We
Articles › ViewI’m a fun-loving person. I love ____ parties and dancing!
A. a
B. an
C. the
D. –
Subject Verb Agreement Irregular Verb › View
You _____ the funniest person.
A. is
B. are