92选B,因为A的 discussed后面不应该有About。96选B,A想用Fact(that)....的句型,但是后面应该是most of us thought true,to be true就错了,B想As从句是表示当...时理解。109,先不要看is on which a hovercraft works,句子变成Read the text a second time and you will probably know what the principle is。这样就理解了吧,后面的 on which a hovercraft works 是 principle的定语从句。