66.The Clarks haven't decided yet which hotel_____.
答案解析
解析：
不定式前可以加某些疑问代词(who,what,which..)、疑问副词(when, where, how,why…)或连词
whether,构成特殊的不定式短语,如 what to do next, which one to choose, how to get there, where to go 等,在句子中作主语、宾语等成分,故可排除选项 B、D。stay 作“暂住,逗留”讲时是不及物动词,其后跟宾语时应加介词,且介词不可省略,所以空处应用 to stay at, which hotel 作at 的宾语。故选C。
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