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Jack could have avoided that terrible car accident, but he ________ careful enough.
A.is notB.was notC.hasn’t beenD.hadn’t been
B
考查时态。根据could have avoided可知本句是对过去所发生情况的虚拟,but后面使用陈述语气,所以使用过去时。句意:Jack本可以避免那可怕的事故,但是他不够小心。
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