[ Grammar ]
More and more trees in the area are found __________ from the effect of polluted air..
A. died
B. to be dying
C. having died
D. to be dead
Select your answer:

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Modal Verbs › ViewHe ………………… be the burglar — his fingerprints are all over the safe.
A. must
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People who use public parks __________ clean up after themselves.
A. must
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C. ought
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