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题目内容
（西安石油大学大学英语I（下））
________ more careful, his ship would not have sunk.(本题2.5分)
A、 If the captain were
B、 Had the captain been
C、 Should the captain be
D、 If the captain would have been
A、 If the captain were
B、 Had the captain been
C、 Should the captain be
D、 If the captain would have been
参考答案