Jack could have avoided that terrible car accident, but he ________ careful enough.
A．is notB．was notC．hasn’t beenD．hadn’t been
B
考查時態(tài)。根據(jù)could have avoided可知本句是對過去所發(fā)生情況的虛擬，but后面使用陳述語氣，所以使用過去時。句意：Jack本可以避免那可怕的事故，但是他不夠小心。
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