6.Teenagers ________ their sense of hearing because they always wear earphones.( )
A. | damage | B. | are damaging | C. | has damaged | D. | will damage |
19.-What's the noise outside?
-Some children_____ hide-and-seek in the yard.( )
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-Some children_____ hide-and-seek in the yard.( )
A. | were playing | B. | are playing | C. | have played | D. | played |