题目: . Mary was so glad _______ she was invited to attend the most important party.A.thatB.whereC.whyD.when 答案: 答案:D考查连词。Where哪里,why 为什么,when 当什么时候,句意:玛丽如此的高兴当她被邀请参加一个重要的聚会的时候。所以选D。