问题
单项选择题
—You'd better （）work too hard like this.
—I see. You mean （）too hard makes one tired and ill.
A. not ; work
B. don't ; working
C. don't; to work
D. not; working
答案
参考答案：D
解析：
You'd better (not) do sth．是常见搭配，排除B，C。mean to do打算做；mean doing意味着做。末句应该用动名词。故选D。