【问】 the most important problem，a most important，most important这三者之间有什么区别?
 【答】 A.副词most与二音节以及多音节的形容词连用构成最高级时，必须带定冠词(the
 most important problem)：
 He was the most distinguished physician in Europe.
 他是欧洲最杰出的内科医生。
 B.在most之前如果用了不定冠词a(an)，则most就不再是构成最高级的手段，而变成一种强化语了(extremely，very)：
 1. This is a most useful book.
 这是一本极有用的书。
 2. He told me a most amusing story.
 他给我讲了一个很逗人的故事。
 3. He is a most remarkable man.
 他是一个很不寻常的人。
 4. She was most rude to me.
 她对我很粗鲁。
 当most+形容词+复数名词时，most也可能是强化语：
 They are most useful alloys.
 它们是极其有用的合金。
 C.如果most之前不带定冠词the，也不带不定冠词a(an)，则从形式上看most既可以理解为最高级，也可以理解为强化语(extremely)：
 1. Della is most efficient. (the most efficient of all或extremely efficient)(CGEL)
 德拉办事能力最(很)强。
 2. You are most convincing.
 你最(很)有说服力。
 3. She was most rude to me
 她对我最(很)粗鲁。
 请做下面的英语试题：
 He had，in short，all the essentials for the portrait of________ interesting and unusual youngman.
 A. the most B. a more
 C. a most D. more than an