【題目】I always had doubts he would be the best man for the job , but now I don’t doubt he can do it.

A. whether; whether B. that ; if

C. if; whether D. whether; that

【答案】D

【解析】試題分析：考查名詞性從句的連接詞。Doubt whether（否定句）擔(dān)心…是否…,doubt that（肯定句）懷疑……。句意：我總是擔(dān)心他是否是那個最合適這項(xiàng)工作的人，但是現(xiàn)在我不懷疑他可以勝任。故選D。

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