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It seems that water from this tap ________ for some time.We'll have to take it apart to put it right.
A．had leakedB．is leaking
C．leakedD．has been leaking
D

根據(jù)句中時(shí)間狀語(yǔ)for some time以及后一分句的動(dòng)詞時(shí)態(tài)可知，選項(xiàng)動(dòng)詞動(dòng)作強(qiáng)調(diào)到現(xiàn)在為止并仍在繼續(xù)，故應(yīng)排除選項(xiàng)A、C。由于選項(xiàng)B現(xiàn)在進(jìn)行時(shí)不可與一段時(shí)間狀語(yǔ)連用，所以排除選項(xiàng)B，選D現(xiàn)在完成進(jìn)行時(shí)。
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