问几个高中英语单选 1.The research is so designed that once _____nothi

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问几个高中英语单选
1.The research is so designed that once _____nothing can be done to change it.A.begins B.having begun C.beginning D.begun
2.I would appreciate_____back this afternoon.
A.you to call B.you call C.your calling D.you're calling
3.The managers discussed the plan that they woukd like too see____the next year.
A.carry out B.carring out C.carried out D.to carry out
4.The mayor of Beijing says that all construction work for the Beijing Olympics_____by 2006.
A.has been completed B.has completed C.will have been completed D.will have completed.
主要是讲解书上没具体解释
鄙视下新申请的号分不多

1.D.begun
这里是过去分词短语once begun做状语.主语The research 与begin这个动作逻辑上是被动关系.
2.C.your calling
appreciate +动名词的复合结构为正确表达.另尚有appreciate sth.的用法.而无appreciate sb to do sth.
3.C.carried out
see sth+过去分词为正确表达.因为plan是被人完成的.
4.C.will have been completed
这是在考你将来完成时态.说这句话的时间应在2006年之前.如2005,2004句子才成立.
另“by+某个时间”是完成时态的重要标志.但至于是过去完成时,现在完成时或将来完成时则取决于后面的时间点.

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