[求助]大全980

980.
            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

是不是在G的语法中么有all....not 和not all的区别啊？

自己顶下~哈~

请指教啊~