The boy was saved because the doctor arrived there _____ it was too late.
A．beforeB．sinceC．orD．while
A
考查狀語從句。因?yàn)獒t(yī)生及時(shí)到達(dá)久了那個(gè)男孩一命，根據(jù)題意，醫(yī)生在太晚之前到達(dá)，也就是說及時(shí)到達(dá)。
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