问题补充：
----Are you a volleyball player in your school?
----Yes. Ithe team a year ago and I on the team for a year.
A. have joined, have been
B. was joined ,am
C. joined，was
D. joined, have been
答案：
A. have joined, have been
(答案→)B. was joined ,am
C. joined，was
D. joined, have been
解析：句意：你在你们学校是个篮球运动员吗？是的。一年前我加入了这个队，我加入这个队已经一年了。a year ago是一般过去时的时间状语，故用一般过去时，由for a year当时间状语为一段时间时，动词应用延续性动词。结合句意，故选B.
