问题补充：
I always have so many things to when I come back to the company after a trip abroad.
A. add to
B. contribute to
C. attend to
D. appeal to
答案：
A. add to
B. contribute to
(答案→)C. attend to
D. appeal to
解析：考查词组辨析：A. add to增加，B. contribute to贡献，有助于，C. attend to照顾，处理，D. appeal to吸引，句意是;当我从国外旅游回来总是有这么多事要处理。选C
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