The coats are 200 dollars each butwe offer a discount of 30% you’ll get one for only 140

问题补充：

The coats are 200 dollars each, butwe offer a discount of 30%, you’ll get one for only 140 dollars.

A. though

B. unless

C. before

D. since

答案：

A. though

B. unless

C. before

(答案→)D. since

解析：考察连词词义辨析。A尽管；B除非，如果…不…;C在…之前；D因为；句意：这些外套每一件都是200美元。但是因为我们打折百分之30，所以你只要140美元。根据句意说明D正确。