21．The moment we heard the news of the earthquake, we began to the work to rescue those w

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 down
C. set aside
D. set about

A. set off　　　B. set downC. set aside(答案→)D. set about解析：“set about sth./doing sth.”“开始做，着手做……”；A项意为“出发；动身；启程”；B项意为“写下，记下”；C项意为“把……放到一旁；省出，留出（钱或时间）。”本句译为“我们一听说地震的消息就立即开始着手救援那些被困在楼房中的人们”。

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