At a construction site in our city the workers have uncovered an ancient wall that_______ to keep the enemy out of the city, but it requires further evidence.
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A
might have functioned
B
would have functioned
C
must have functioned
D
should have functioned
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It was Mr Zhang that helped us out of the trouble. Without his help, we ______ it so easily.
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A
can’t manage
B
mustn’t have managed
C
couldn’t have managed
D
couldn’t manage
You _____ an A on your composition, but there were some spelling mistakes.
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A
should receive
B
could have received
C
would receive
D
must have received