[ Grammar ]
The Russians launched the first artificial satellite in 1957.
A. Simple Present Tense
B. Present Progressive
C. Simple Past
D. Present Perfect
Select your answer:
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Grammar, Conditional Sentences, Vocabulary › ViewWe might have been at the airport for hours, if we _______ that the flight was delayed.
A. had known
B. had not known
C. know
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You……………be careful when you cross the street.
A. must
B. mustn’t