That dog ought to be destroyed        it attacks any more children.
A．untilB．sinceC．a(chǎn)fterD．before
D
考察時(shí)間狀語從句的連接詞。結(jié)合句意可知D正確。句意：那條狗應(yīng)該在攻擊另一個(gè)孩子之前就被殺死。Before…之前。
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