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

A. standing by       B. turning on       C. getting on           D. running on

       A      


解析:

       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；turn on 打開；get on進展；run down撞倒。 

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