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By the end of this century an intelligent robot ______to do most of the housewor
By the end of this century an intelligent robot ______to do most of the housewor
游客
2023-11-10
14
管理
问题
By the end of this century an intelligent robot ______to do most of the housework for men.
选项
A、is expected to be invented
B、will have been expected to be invented
C、has been expected to be invented
D、is expected to have been invented
答案
D
解析
动词时态题。by the end of this century决定本句时态应该使用将来完成时。而句子中的谓语动词expect表示的“人们现在的一种期望”,因此不能使用完成时。而动词invent则表示“到本世纪末被期望完成的动作”,因此完成时应体现在动词invent上。故D正确。
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