The Titanic ,the biggest ship of its day,_ unsinkable ,but it sank on its first voyage in 1912.A.thoughtB.was thoughtC.thought itD.was thought it为啥?

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The Titanic ,the biggest ship of its day,_ unsinkable ,but it sank on its first voyage in 1912.
A.thought
B.was thought
C.thought it
D.was thought it
为啥?

B.was thought
被动句式,用BE+动词过去分词
thinK的过去分词是thought
它被认为是不可沉没的.

The Titanic was thought unsinkable.
铁达尼号被认为是不可沉没的。