The burlars themselves were(be) no longer there,but they probably only just had left(only just leave)because a cigarette is(be)still burning on the table.
树瘤本身早已不在那儿了,但它们也许并不是刚刚离开,因为香烟还在桌子上燃烧.
were 他们不在这了，动作以结束，用过去时
have left only just 他们已经离开了，离开这个动作已经完成了，所以用过去完成时
is 现在时，烟还在着呢
are
only just have left
is
不确定~
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