【题目】Many scientists believe that robots __________ able to talk like humans in 50 years.
A. wereB. are
C. will beD. have been
在线课程【答案】C
【解析】
考查时态。句意：许多科学家认为，五十年过后，机器人将能够像人类一样说话。描述＂五十年后＂将要发生的动作或状态，用一般将来时态。故选C。
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