________ he driven more carefully, the accident would not have happened the other day.
A．BeB．HadC．HasD．Would have
B
考查虛擬語氣。“如果他開車在小心一點，事故就不會發(fā)生了。”根據(jù)主句的would not have happened可知，與過去相反，故用過去完成時，即If he had driven...，If引導的虛擬語氣常用省略形式，把had提前，即Had he driven...。故選B。
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