—Do you think the weather will be fine this spring?—No, we are fortunate. The weatherman forecasts there will be several sand storms.A.if B.as C.though D.unless 答案：【答案】D【解析】考查状语从句。句意：——你认为今年春天天气会好吗？——不，除非我们很幸运，否则的话今年春天不会有好天气。天气预报员预测将有几场沙尘暴。A. if如果；B. as正如；C. though虽然；D. unless除非。此处为条件状语从句，根据句意，表示“除非”应用unless。故选D。