单选题 By the end of this century, business ______greatly.

A、 (A) will be changed
B、 (B) will have changed
C、 (C) changes
D、 (D) changed

【正确答案】 B

【答案解析】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.