I saw Helen at the party last month. It a year since we met last time.
A. was
B. is
C. has been
D. would be
网友回答
(答案→)A. was
B. is
C. has been
D. would be
解析：句意：上个月我在舞会上看见Helen了。从上一次我们见面，到上个月在聚会上看见她，已经有一年的时间了。句型‘It is/has been /was+时间段+since+一般过去时’为固定用法。但是主句的动作也已经发生了。所以要用过去时不涉及现在。故选A。
考点:考查It句型的用法。