英语单项选择试题By the end of the year 2050,air pollution ___a serious problem that endangers the health of the human race.A.will have become B.shall become C.will become D.shall have become本人刚考完的英语试题.望详尽解释,并

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英语单项选择试题By the end of the year 2050,air pollution ___a serious problem that endangers the health of the human race.A.will have become B.shall become C.will become D.shall have become本人刚考完的英语试题.望详尽解释,并
英语单项选择试题
By the end of the year 2050,air pollution ___a serious problem that endangers the health of the human race.
A.will have become B.shall become C.will become D.shall have become
本人刚考完的英语试题.望详尽解释,并解释一下shall和will用法上的区别.

英语单项选择试题By the end of the year 2050,air pollution ___a serious problem that endangers the health of the human race.A.will have become B.shall become C.will become D.shall have become本人刚考完的英语试题.望详尽解释,并
A.will have become
到2050年,(现在还没到,所以是将来时,而by.直到.通常要用完成时)
空气污染就会成为威胁到人类健康的一个严重的问题.
因为有一种影响/结果,所以一定要用完成,而时间还没到呢,所以要用将来.
即:将来完成时.
shall主要第一/三人称,
will第二人称,还可表示客观,shall多主观.

A
by结构通常时态为完成时。2050并未到来，因此是将来时
shall表示将来时，主语通常是第一人称

选A
By the end of + 将来的时间状语，要用将来完成时，所以排除BC
shall 只用于主语是第一人称的时候，所以也排除。

a
shall 通常第一人称

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