12．I have some doubt that John will come on time．

分析 我懷疑John是否會(huì)按時(shí)到來．

解答 答案：that改成whether 
固定句型：have some doubt whether…"對(duì)…有疑問的"；若用在否定句中則用that：have on doubt that…；故將that改成whether．

點(diǎn)評(píng) 解答該類題的時(shí)候，應(yīng)注意觀察該句子的語(yǔ)法結(jié)構(gòu)和人稱和數(shù)，再結(jié)合其具體用法將錯(cuò)誤糾正．考生平時(shí)也應(yīng)注意積累相應(yīng)的知識(shí)．

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