12.(2017·浙江名校新高考研究联盟联考)There is still some doubt ________ the system will work even though all the factors have been considered.
答案:whether 解析:考查同位语从句。句意:即使所有的因素都考虑了,系统是否会运行仍有些疑问。whether引导的同位语从句作doubt的同位语,whether表示“是否”。
13.(2017·北京东城区高三检测)John seemed puzzled about ________ the question meant.
答案:what 解析:考查宾语从句。句意:John似乎对这个问题意味着什么感到很迷惑。根据句子的结构判断,about后接的是宾语从句,而从句中缺少宾语,再结合句意可知,要用what。
14.The teacher won't explain ________ it is that makes his students so fascinated by his lessons.
答案:what 解析:考查宾语从句。“________ it is that makes...by his lessons”为宾语从句,另外,从句使用了强调句型,强调主语what。
15.It is announced that big prizes will go to ________ finishes the assignment on time.
答案:whoever 解析:考查宾语从句。分析句子结构可知,“________ finishes the assignment on time”是宾语从句,从句中缺少主语;再结合“大奖将颁给任何一个按时完成任务的人”可知,此处应用whoever。
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