讨论] 大全 980，不能改变愿意？

cathy0929

    The Immigration Service now has the discretionary power to keep families united even though all their members do not meet the five-year residency requirement.

(A) all their members do not meet the five-year residency requirement

(B) not all their members meet the five-year residency requirement

(C) all their members have not met the requirement for a five-year residency

(D) not all their members have resided for five years, a requirement（B）

(E) all their members have not resided for five years, as required

 

这道题我一开始也是选择B，但是想到not all 和 all....do not 意义上有本质区别，所以后来还是选择了A，但是正确答案是B，为什么