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

分析 人類能夠在太空旅行已經(jīng)不再是問(wèn)題．

解答 答案是that．本題考查從句引導(dǎo)詞；題干中it為形式主語(yǔ)，主語(yǔ)從句"man can travel in space"從意思到成分都是完整的，所以選擇 在名詞性從句中不擔(dān)任成分、無(wú)意義that，除了在賓語(yǔ)從句中之外，that不可以省略；故答案是that．

點(diǎn)評(píng) 本題考查單詞填空，做此類題目時(shí)一定要仔細(xì)分析句子結(jié)構(gòu)，從語(yǔ)法、句意、時(shí)態(tài)等各方面判斷所填詞的正確形式．

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