问题
选择题
_______for the captain ,the ship would have sunk with all on board .
A． Hadn’t it been
B．Had it been not
C．Not had it been
D．Had it not been
答案
答案：D
这相当于if引起的条件状语从句的虚拟语气的句子，把Had提到前面，句子用倒装语序。
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