______ their homework, these three students have to stay in the classroom for another thirty minutes.
A．Not finishing B．Not finished
C．Having not finished D．Not having finished
D
考查非謂語動(dòng)詞。句意：（由于）沒有完成他們的作業(yè)，這些學(xué)生不得不在教室里再呆三十分鐘�，F(xiàn)在分詞作原因狀語表示正在進(jìn)行的伴隨性動(dòng)作，如果動(dòng)作發(fā)生在謂語動(dòng)詞之前，則用完成時(shí)態(tài)的過去分詞，故選D。
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