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- 2011-7-21
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OG12 11 There are several ways to build solid walls using just mud or clay, but the most extensively used method has been to form the mud or clay into bricks, and, after some preliminary air drying or sun drying, to lay them in the wall in mud mortar. OG12 15 Warning that computers in the United States are not secure, the National Academy of Sciences has urged the nation to revamp computer security procedures, institute new emergency response teams, and create a special nongovernment organization to take charge of computer security planning. OG12 51 A new study suggests that the conversational pace of everyday life may be so brisk that it hampers the ability of some children to distinguish discrete sounds and words and, as a result, to make sense of speech. OG12 55 Many house builders offer rent-to-buy programs that enable a family with insufficient savings for a conventional down payment to move into new housing and to apply part of the rent to a purchase later. OG12 62 When Congress reconvenes, some newly elected members from rural states will try to establish tighter restrictions on the amount of grain farmers will be allowed to grow and to encourage more aggressive sales of United States farm products overseas. 这几个平行结构的例子里,只有15题省略了to,其他的都没省略。to在平行结构里省略是有规则的还是除了第一个to不能省,其他的可省可不省? 想了一天这个问题了,还是没有看出什么规律,请各位XDJM来帮忙啊 |
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