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11.It is no longer a question nowthat man can travel in space.

分析 人类能够在太空旅行已经不再是问题.

解答 答案是that.本题考查从句引导词;题干中it为形式主语,主语从句"man can travel in space"从意思到成分都是完整的,所以选择 在名词性从句中不担任成分、无意义that,除了在宾语从句中之外,that不可以省略;故答案是that.

点评 本题考查单词填空,做此类题目时一定要仔细分析句子结构,从语法、句意、时态等各方面判断所填词的正确形式.

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