47.A.The summer vacation (being) over是独立主格结构在句中作状语.

46.B.bought through a computer是过去分词短语作定语.

45.A.Once caught为Once you are caught 的省略; catch sb. doing sth.意为“发现或发觉某人正在做某事”.

44.B.devote ... to ...中,to为介词.

43.B.此题考查would like sb. to do 的结构.题中的introduce与whom之间是被动关系.

42.A.英语中,许多动词(如:know ,decide, tell sb., show sb.等)后可接疑问代词或疑问副词+不定式短语的结构来作宾语.题中knew what to get相当于knew what they would get.

41.A.carried out 与said是两个对等成分.

40.C.此题考查“too...to...(太……而不能……)”句型.

39.B.everything taken into consideration是独立主格结构在句中作状语.

38.C.此句考查-ing形式的复合结构在句中作主语,其否定形式是在-ing形式前加not.