Question

－Your aunt often walks the dog in the morning.－Yeah,      bad weather stops her.

A． unless

B． when

C．because

D．since

Answer 1

A

试题分析：unless除非，如果不；when当……时；because 因为，由于；since自从……以来，由于。句意：你的姑姑常常在早晨遛狗。——是的，除非糟糕的天气阻止她。结合语境可知选A。