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

解析試題分析：unless除非，如果不；when當(dāng)……時；because 因為，由于；since自從……以來，由于。句意：你的姑姑常常在早晨遛狗。——是的，除非糟糕的天氣阻止她。結(jié)合語境可知選A。
考點：考查連詞。