[ Grammar ]
The patient will not recover unless he __________ an operation.
A. had undergone
B. would undergo
C. undergoes
D. was undergoing
Select your answer:
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Tenses › ViewFill in the blank: They _________ for hours before the guests arrived.
A. had been preparing
B. were preparing
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Grammar & Vocabulary › View
The big house was __.
A. tiny
B. narrow
C. spacious