36. _____ a pet is good to the health of the elderly, especially those who live alone.
(A) Keep
(B) Keeps
(C) Kept
(D) Keeping

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統計： A(50), B(13), C(10), D(419), E(0) #2136777

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分詞構句當主詞 動詞單數分詞 keepi...
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