It is taken as a great contribution made by ______ that languages in the world are classified into different language families according to their genetic relations.

Speech Act Theory was first proposed by______.A．John Se...

单项选择题Speech Act Theory was first proposed by______.

In1066, England was invaded by______.A．VikingsB．King of...

单项选择题In1066, England was invaded by______.

The study of the rules governing the ways words are com...

单项选择题The study of the rules governing the ways words are combined to form sentences is ______.