In the swimming race, three boats will be ______in case of an emergency.


  1. A.
    standing by
  2. B.
    turning on
  3. C.
    getting on
  4. D.
    running on
A
題意：有有三只船嚴(yán)陣以待，預(yù)防緊急情況。stand by 準(zhǔn)備行動；待機(jī)；turn on 打開；get on進(jìn)展；run down撞倒。
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