问题补充：
--- Has your brother returned from America yet?
--- Yes, but he here for only three days before his company sent him to Africa.
A. has been
B. was
C. will be
D. would be
答案：
A. has been
(答案→)B. was
C. will be
D. would be
解析：考查时态。根据语境可知他在这儿仅三天，为过去发生的事情，故用一般过去时态。句意：——你哥哥从美国回来了吗？——是的，但在这里就3天，他的公司又派他去非洲了。
