An investigation that is _______ canoccasionally yield new facts, even notable ones, but typically the appearance of such facts is theresult of a search in a definite direction.
(A) timely
(B) unguided
(C) consistent
(D) uncomplicated
(E) subjective
KEY:B
1.关键字：“but”
2.空中应该填入一个形容词，是对于“an investigation”的一种形容;
3.后半句中有but出现，应该是与前半句表达相反的意思，而后半句中的“a search”是前半句中的“an investigation”的同义替换，因此空中应该填入一个与在后半句中形容search相反的词语，即“not in a definite direction”。
