单项选择题If the distribution of a construction is functionally equivalent to that of one or more of its constituents, the construction is called ______.

单项选择题What is the character of British labor force

单项选择题______ is the capital of Scotland since the 15th century.

单项选择题The Germanic tribes came to England from the continent about the middle of the 5th century were the Angles, Saxons and ______.

单项选择题In T.G, the structure that contains all the unit and relationships that are necessary for interpreting the meaning of the sentence is ______.