[ Grammar ]
What the problem is ………………by tomorrow.
A. will have discovered
B. has been discovering
C. being discovered
D. will have been discovered
Select your answer:

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Simple Present and Simple PastPhrase and ClauseModals TensesSimple Future - WillPast Modals & Phrasal Modals of ObbligationPassive with ModalsCOUNT - NONCOUNT NOUNSDo not- Does notPreposition of PlaceTOEFLOther quiz:
Subject-Verb Agreement › ViewNeither my roommate nor my neighbors ________ my loud music.
A. Likes
B. Like
Grammar › View
We waited _____ you _____ 11.00.
A. at / to
B. for / until
C. for / to
D. with / since
