2. 外语
  3. Drivers waiting in the loading zone must switch off the engines of their delivery vans and avoid leaving them______.

Drivers waiting in the loading zone must switch off the engines of their delivery vans and avoid leaving them______.

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问题 Drivers waiting in the loading zone must switch off the engines of their delivery vans and avoid leaving them______.
选项 A、idle
B、valid
C、blank
D、empty
答案A
解析 根据上下文语义，此处意为“驾驶员在装载区等待时注意熄火并避免挂空挡”，所以这里应填入形容词(A)idle(空档；懒惰的)。(B)valid表示“有效的”，(C)blank表示“空的，空白的”，(D)empty表示“空的”。作为参考，应了解“leave+宾语+补语”表示“让……处于……状态”。另外，需要照看的设备或车辆没人照看时，用unattended(无人照看的)表示。
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