问题
单项选择题
It seems water______from this tap for some time. We'll have to take it apart to put it right.
A. had leaked
B. is leaking
C. leaked
D. has been leaking
答案
参考答案：D
解析： 根据时间状语for some time以及后一分句的动词时态可知，选项动词动作强调到现在为止仍在继续，故应排除选项A、C。由于现在进行时不可与一段时间状语连用，所以排除选项B，选D现在完成进行时。