问题补充：
It’s time since we met last .
A. one and half month’s
B. one and a half months
C. one and half months’
D. one and a half months’
答案：
A. one and half month’s
B. one and a half months
(答案→)C. one and half months’
D. one and a half months’
解析：句意：自从我们上个月见面已经有一个半月的时间了。时间地点的名词所有格也可以加’s。名词复数以s结尾，只加’不加s。one and half months一年半的时间，名词复数，故选C
