2. 外语
  3. AIDS is said_____the No. 1 killer of human kind over the past few years.

AIDS is said_____the No. 1 killer of human kind over the past few years.

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问题 AIDS is said_____the No. 1 killer of human kind over the past few years.
选项 A、being
B、to be
C、to have been
D、having been
答案C
解析 语法类试题。be said to be表示“据说目前是”，be said to have been表示“据说过去已经是”。
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