21．The moment we heard the news of the earthquake, we began to ________ the work to rescue those who were trapped in the building.
A．set off　　　B．set downC．set asideD．set about
D
“set about sth./doing sth.”“開始做，著手做……”；A項意為“出發(fā)；動身；啟程”；B項意為“寫下，記下”；C項意為“把……放到一旁；省出，留出（錢或時間）�！北揪渥g為“我們一聽說地震的消息就立即開始著手救援那些被困在樓房中的人們”。
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