[ 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:
Homonyms › ViewHarry carried his golf ___ in his hip pocket.
a. tease
b. tees
Phrasal Verbs › View
People in the village ________ mostly ________ the sea.
A. live …in
B. live…on
C. live…off
D. live….from
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