11. Once they had seen the report from the medical examiner, the investigators did not doubt whether the body recovered from the river was the man who had attempted to escape from the state prison.
(A) did not doubt whether the body recovered from the river was
(B) have no doubt whether the body recovered from the river was
(C) had not doubted that the body recovered from the river was
(D) have no doubt whether the body recovered from the river was that of（E）
(E) had no doubt that the body recovered from the river was that of
doubt 后面加whether ,或者that,有什么区别来者？
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