第10题: [单项选择]The directions were so _______ that it was impossible to complete the assignment. A. ingenious B. ambitious C. notorious D. ambiguous 参考答案:D 答案解析:[解析] A. ingenious心灵手巧的,奇妙的;B.ambitious野心勃勃;C. notorious臭名昭著的;D.ambiguous不明确的,有歧义的。根据句意应选D。句意为:由于指示不明