题目内容：
Shopping for clothes is not the same experience for a man as it is for a woman. A man goes shopping (11)______ he needs something. His purpose is settled and decided (12)______ . He knows what he wants and his objective is to find it and (13)______ it；the price is a secondary (14)______ . Most men (15)______ walk into a shop and ask the salesman (16)______ what they want. If the shop has it in stock. the salesman promptly (17)______ it，and the business of trying it on proceeds (18)______ . Au being well,the (19)______ can be and often is completed in less than five minutes，with hardly any bargain and to their satisfaction. For a man，slight problems may begin when the shop does not have what he wants. (20)______ does not have exactly what he wants. In that case the salesman，as the name implies，tries to sell the customer something else.(11)
A．although
B．before
C．unless
D．because
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