By the end of this century, business ______greatly.

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问题 By the end of this century, business ______greatly.

选项 A、will be changed
B、will have changed
C、changes
D、changed

答案B

解析 Future perfect tense indicates a future action that will occur before another future action. Choice (A) is the passive form of the future. Choice (C) is the present tense. Choice (D) is the past tense.  
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