With some technical problems to be solved, it may be a while the system
题型:不详难度:来源:
With some technical problems to be solved, it may be a while the system is put into use.A.when | B.after | C.since | D.before |
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答案
D |
解析
句意:有一些技术问题要解决,所以在这个系统投产前还需一段时间。所以选D。 |
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