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题库 / Prep2007E1-SC-163
The British sociologist and activist Barbara Wootton once noted as a humorous example of income maldistribution that the elephant that gave rides to children at the Whipsnade Zoo was earning annually exactly what she then earned as director of adult education for London.
that the elephant that gave rides to children at the Whipsnade Zoo was earning
that the elephant, giving rides to children at the Whipsnade Zoo, had been earning
that there was an elephant giving rides to children at the Whipsnade Zoo, and it earned
the elephant that gave rides to children at the Whipsnade Zoo and was earning
the elephant giving rides to children at the Whipsnade Zoo and that it earned
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过去完成时：
1、表示过去的过去。要使用过去完成时，要求句子里有一个一般过去式动词，或者一个过去的时间词语发生在过去完成时的动作之后。
eg.:
(1)The film had started by the time we arrived at the theater.
film had started在先，然后We arrived
(2)By 1945, the United States had been at war for several years.
1945是过去的时间，had been at war发生在1945年之前
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