2. 外语
  3. By the time Call Mate Inc. finished testing its video cell phone, several competing firms______similar models.

By the time Call Mate Inc. finished testing its video cell phone, several competing firms______similar models.

admin2016-10-30  59
问题 By the time Call Mate Inc. finished testing its video cell phone, several competing firms______similar models.
选项 A、have launched
B、had launched
C、were launched
D、will launch
答案B
解析 在做有关时态的题时，首先要仔细分析前后句。该句直译过来是“在几个竞争公司已经将类似模式投放市场之后，电话公司才进行产品测试”。所以主句应该用过去完成时。正确答案是(B)had launched。
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