单项选择题

Sometimes a situation will ()a direct style. of management.

A、call up
B、call for
C、call on
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单项选择题
Product advertising aims at increasing sales by making a product known to a wider audience.()
A. 产品广告旨在通过广泛宣传其产品来提高销售。
B. 产品广告提高了销售，从而让广大消费者了解了产品。
C. 产品广告在增长销售的同时也把产品推荐给了消费者。
单项选择题
You just send the faulty product back to them and they ()it free of charge.
A、will replace
B、replace
C、have replaced
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