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It______ a calm head to find the best solution to such a difficult problem within a short time.
A．costsB．takesC．spendsD．needs
B
此題考查動詞辨析。take在此作“需要”講，It takes sth.to do sth.“做某事需要……”。句意：這么短的時間內(nèi)解決這么難的問題需要冷靜的頭腦。
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