急求几道高中英语题目,请大家帮帮忙啦~~~十分感谢

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急求几道高中英语题目,请大家帮帮忙啦~~~十分感谢
有解释最好啦~~~拜托了!
1.All the tasks( )ahead of time,they decided to go on holiday for a week.
A.had been finished B.were finished
C.having been finished D.been finished
2.His article ( )enough supporting ideas.
A.is lacking of B.lack
C.lacks of D.is lack of
3.-My uncle will be here to attend a meeting tomorrow.
-Oh,I thought that he ( )today.
A.was coming B.is coming C.will come D.could come
4.When last ( )valuable,those books enjoyed great success.
A.finding B.found C.being found D.to be found

1C 所有这些任务提前被完成,所以必须用过去分词表被动的意思,having been finished 要与后面的主语they 一致.
2D 固定搭配
3A I thought that he ( )today.要与thought 一致的话就只能选A.was coming 表示要来的意思
4Cthose books 做主语,所以从句要用现在分词,而且书应该是被发现有价值的.

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