Thisisanimportantproblem_______toofewsocialscientistshaveresearched.
A、whichD
into which 引导的是 problem 的定语从句。 which 指代 problem ，into 与 research 搭配。
_______isafactthatEnglishisbeingacceptedasaninternationallanguage.
ModernEnglishwordsman,woman,child,eat,fight,etc,originatefrom______.
Accordingtothe"principles-and-parameters"theory,"principles"refertohighlyabstractpropertiesofgrammarwhichareappliedtolanguageingeneralandwhichgeneratephrasesandatthesametimerestrainthepowerofMovea,while"parameters"allowgeneralprinciplestooperateincertainrestrictedways,accordingtowhichparticulargrammarsofnaturallanguagesvary.
Thesyntacticrulesofanylanguageare______innumber.
_______forthefreeticket,Iwouldnothavegonetoseefilmsooften.
