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Bytheendoftheyear2050,airpollution___aseriousproblemthatendangersthehealthofthehumanrace.A.w

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

单项选择 yesterday he told me that he had met his uncle ( A at an end .B in the end C by the end D at the end 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 单项选择：The price of the car increased_____10%_____of last month.选项：A.to;at an end B.to;at the end C.by;at an end D.by;at the end请问选什么?为什么? 英语单项The project______ by the end of 2004 has benefited 100,000 people in the city.The project______ by the end of 2004 has benefited 100,000 people in the city.A.completed B.having been completed 英语模拟题单项选择求大神 (ㄒoㄒ) 英语单项选择2 单项选择,英语, 英语,单项选择 单项选择 英语 单项选择英语 单项选择,英语 单项选择 英语 英语单项选择 单项选择英语 单项选择.英语 单项选择,英语 单项选择（英语） 英语单项选择求