问题
To keep healthy, Professor Johnson __________cycling as a regular form of exercise after he retired.
A:made up
B:put up
C:took up
D:carried out
B:put up
C:took up
D:carried out
正确答案是：
同类题型
The use of computers has made ______ possible for more people to work at home.
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lecture, the professor referred to the belief, in contrthat; one