2. 外语
  3. Acute hearing helps most animals sense the approach of thunderstorms long before people ______.[2000]

Acute hearing helps most animals sense the approach of thunderstorms long before people ______.[2000]

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问题 Acute hearing helps most animals sense the approach of thunderstorms long before people ______.[2000]
选项 A、do
B、hear
C、do them
D、hearing it
答案A
解析 在before引导的时间状语从句中使用助动词do来代替sense the approach of thunderstorms，故选项A正确。
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