12. A study shows that owning pets can be a means of therapy for many kinds of
individuals. For example, emotionally disturbed children _____ observed to smile
and react with interest if there is a cuddly kitten or puppy to hold.
(A) has been
(B) had been
(C) have been
(D) were
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一項研究表明，擁有寵物可以成為許多人的一...
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