2. 外语
  3. 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

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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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