Mr. Johnson always carries a notebook, in which he everything that happens.
A. sets down
B. sets up
C. sets off
D. sets about
网友回答
(答案→)A. sets down
B. sets up
C. sets off
D. sets about
解析：考查动词短语：A. sets down记下，B. sets up成立，C. sets off出发，引发，D. sets about开始，着手做…，句意：Johnson先生总是带个笔记本，在里面会记下发生的事情。选A。