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i _____ whether he will make good progress before long.

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i _____ whether he will make good progress before long.
A doubted B have no doubt C don't doubt D have a doubt
请问前面选择不可选择的原因是什么?
A 错,因为用了过去时.
B 错,因为have no doubt 后面必须用that 引导句子,而不能用whether.
C 错,理由同上.have no doubt = don't doubt.