The police said they would not give up looking into other possibilities ____they find out what happened.
A．a(chǎn)sB．whileC．untilD．a(chǎn)lthough
C
考察連詞。該句為not ……until……結(jié)構(gòu)，直到……才……
句意為警察說他們不會放棄調(diào)查其他的可能性，直到他們發(fā)現(xiàn)到底發(fā)生了什么。
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