Not a ____has been found so far that can help the police find the criminal.
A.fact
B.clue
C.symbol
D.sign
拓展
①fact n.事实;真相➢As a matter of fact, business has come to a stop.事实上，业务已停止了。
②clue n.线索;提示;(帮助警方破案的)线索
③symbol n.象征，代表;标志➢White is the symbol of purity.白色是纯洁的象征。
④sign n.迹象;符号;v.签字➢Looking around, I could see no sign of life.四处环顾后，我看不出有生命的迹象。
解析
本题答案：B
翻译：到目前为止还没有找到任何能帮助警方找到罪犯的线索。
