The police need some more evidence ________they can make a conclusion.
A．sinceB．beforeC．a(chǎn)fterD．until
B
考查連詞。Since自從……以來；before 在……之前；after 在……之后；until直到。句意為，警察在得出結(jié)論之前需要更多的證據(jù)。故選B。
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