The policemen had no ______ in finding the knife that the murderer had thrown.
A．difficultyB．troublesC．problemsD．question
A

試題分析：句意：警察毫不費力地找到了殺人犯扔掉的刀子。have difficulty/trouble (in) doing sth. 做某事毫不費力，是一個固定短語，此短語要須注意，difficulty, trouble都是不可數(shù)名詞。
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