—Uncle John is badly ill these days.—Sorry to hear that. he leaves the bad factory he won

问题补充：

—Uncle John is badly ill these days.

—Sorry to hear that. he leaves the bad factory, he won’t be able to get better.

A. If

B. Though

C. Since

D. Unless

答案：

A. If

B. Though

C. Since

(答案→)D. Unless

解析：If是否，如果；Though虽然，尽管；Since由于，自从……以来；Unless除非，如果不。句意：约翰叔叔这些天病得很厉害。——很遗憾听到这个消息。如果他不离开这家糟糕的工厂，他不会好起来。结合语境可知选Ｄ。