问题
选择题
It seems that 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
答案：D
根据句中时间状语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并仍在继续，故应排除选项A、C。由于选项B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。