It seems that oil______from this pipe for some time.We’ll have to take the machine apart to put it right.
A．had leaked B．is leaking
C．leakedD．has been leaking
D
考查時態(tài)。現(xiàn)在完成進(jìn)行時表示從過去一直延續(xù)到現(xiàn)在的動作，而且此動作還有可能延續(xù)下去。
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