问题补充：
--- How long have you there?
--- For about one week.
A. reached
B. gone
C. arrived
D. studied
答案：
A. reached
B. gone
(答案→)C. arrived
D. studied
解析：A．及物动词，到达；B．去，到； C．不及物动词，到达； D．学习。句意：你到哪儿多久了？——大约一个星期。结合语境reach相当于get to后需接具体名词，不能接there；Go为瞬间动词，不能和表示一段时间的时间状语搭配。故选C。
