题干
I have to________my diet rather than eat the same all the time so that I can keep fit.
A：differ
B：vary
C：continue
D：range
答案(点此获取答案解析）
B
I have to________my diet rather than eat the same all the time so that I can keep fit.
A：differ
B：vary
C：continue
D：range
的定义域是（ ）
