In my opinion, keeping dogs well ________ up is advisable for dog owners.
A．to tieB．being tied
C．tiedD．to be tied
C
C 考察非謂語動詞。句義：我認(rèn)為，狗的主人應(yīng)該把狗拴好。Tie和句子主語之間滿意連詞，使用非謂語動詞，且tie與邏輯主語dogs構(gòu)成被動關(guān)系，使用過去分詞。故C正確。
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