2. 外语
  3. As you can see, the number of electronic eyes on our roads ______ rising these days.

As you can see, the number of electronic eyes on our roads ______ rising these days.

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问题 As you can see, the number of electronic eyes on our roads ______ rising these days.
选项 A、was keeping
B、keep
C、keeps
D、were keeping
答案C
解析 根据“as you can see”可判断出要用一般现在时，表示经常发生的动作。
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