2. 外语
  3. Wal-Mart Stores. Inc. began refunding customers for the defective stereos four weeks ______ they first discovered the problem.

Wal-Mart Stores. Inc. began refunding customers for the defective stereos four weeks ______ they first discovered the problem.

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问题 Wal-Mart Stores. Inc. began refunding customers for the defective stereos four weeks ______ they first discovered the problem.
选项 A、like
B、when
C、after
D、before
答案C
解析 语法题。根据题意可知，应该是在发现问题之后才退款，after引导时间状语从句，故选C。
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