In the cross-lake swimming race, a boat will be ____in case of an emergency.
A．standing byB．turning onC．getting onD．running on
A
句意：有船只嚴陣以待，預防緊急情況。stand by 為不及物短語：to wait and be ready for action if needed 準備行動；待機；turn on 打開；get on進展；run down撞倒。根據(jù)句意，B 、C、D 三項均不符合。
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