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People did not begin to use unmanned vehicles in undersea exploration until recently because of______. The sonar devices must b
People did not begin to use unmanned vehicles in undersea exploration until recently because of______. The sonar devices must b
admin
2012-09-10
50
问题
People did not begin to use unmanned vehicles in undersea exploration until recently because of______.
The sonar devices must be placed ______.
选项
A、from time to time
B、after the undersea vehicle dives
C、at the time when the undersea vehicle is diving
D、before the undersea vehicle dives
答案
D
解析
参见第五段最后一句,in advance与本题的正确选项相关。
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本试题收录于:
职称英语理工类A级题库职称英语分类
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职称英语理工类A级
职称英语
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