______ without friends ______ the most difficult challenge for Chuck while living on the island.
A．How to survive, isB．How does he survive, are
C．How does he survive, isD．How to survive, are
A

試題分析：考查主謂一致。句意：當(dāng)庫(kù)克住在島上的時(shí)候沒(méi)有朋友怎樣生存對(duì)他來(lái)說(shuō)是最難的挑戰(zhàn)。排除B和D，是因?yàn)闊o(wú)論是動(dòng)詞不定式還是從句做主語(yǔ)時(shí)謂語(yǔ)動(dòng)詞都用單數(shù)，，C不對(duì)是因?yàn)镃語(yǔ)序不對(duì)，因?yàn)閺木渥鲋髡Z(yǔ)時(shí)是陳述語(yǔ)序，所以A是動(dòng)詞不定式做主語(yǔ)謂語(yǔ)動(dòng)詞用單數(shù)，所以A正確。
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