问题补充：
(·山东实验中学高三二模)—Whats the matter with John? He has been sitting there for hours.
—A postcard from his father an attack of homesickness in him.
A. took up
B. set off
C. brought in
D. built up
答案：
A. took up
(答案→)B. set off
C. brought in
D. built up
解析：选B句意：“约翰怎么了？他一直在那儿坐了好几个小时了。”“父亲寄来的明信片使他想家。”take up“拿起；占据；从事”；set off“出发；引起；使爆炸”；bring in“带来；引进”；build up“逐渐建立”。
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