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(21), B(6), C(3), D(207), E(0) #2136381

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#3744295
動名詞當主詞，動詞為單數。 Keepi...
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