– The kidnapped American captain was rescued from the Somali pirates（海盗）.
-- But for the help of the US Navy, he freed then.
A. may not be
B. wouldn’t have been
C. wouldn’t be
D. mustn’t have been
网友回答
A. may not be
(答案→)B. wouldn’t have been
C. wouldn’t be
D. mustn’t have been
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