英语帝速来啊!they thought it their duty to keep the secret.they thought it is their duty to keep the secret.哪一句是正确的,

英语帝速来啊!they thought it their duty to keep the secret.they thought it is their duty to keep the secret.哪一句是正确的,
英语帝速来啊!
they thought it their duty to keep the secret.
they thought it is their duty to keep the secret.
哪一句是正确的,

英语帝速来啊!they thought it their duty to keep the secret.they thought it is their duty to keep the secret.哪一句是正确的,
第一句对咯 前面已经是thought 后面不能再加is啦

第一句
！

正确的是第二句！因为如果宾语从句表示的是一般真理，就不受时态呼应的限制。在这里“保密是他们的责任”是被他们自己看做“真理”的！是神圣的！所以不需要时态呼应！ 第一句错误！句子结构都不完整！

第二句正确
it作形式宾语，to keep the secret 做真正的宾语。
第一句语法错误
没有 think sth sth的说法think不跟双宾语。