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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