问题补充：
–– When did they arrive?
–– They two hours ago .They here for two hours .
A. arrived; have arrived
B. arrived; have been
C. got; have been
D. reached; have reached
答案：
A. arrived; have arrived
(答案→)B. arrived; have been
C. got; have been
D. reached; have reached
解析：arrive，不及物动词，要搭配介词使用，一般接at，表示到达一点；get在表示到达这个含义时，要搭配介词to；reach及物动词，后面直接接宾语。句意：他们什么时候到达的？——他们两个小时前到的。他们已经到这儿两小时了。结合语境可知前一空描述的是过去的动作，故用一般过去时态。后一空强调的是现在已经完成的动作，故用现在完成时态。Arrive和reach表示瞬间动作，故选B。
