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46. This is the best novel that I ________ in this field.
A. have read B. has read C. read D. reads
【答案】A.
【解析】动词时态。根据句意可知，that引导的从句应用现在完成时，表示动作从过去某一时间开始一直延续到现在，并有可能延续下去。故选A。
47. It troubled him a lot ________ she refused to answer his call.
A. while B. that C. if D. for
【答案】B.
【解析】主语从句。分析句子结构可知，It在句中作形式主语，真正的主语是空处引导的从句，所以应用在从句中不作句子成分，只起连接作用的that。故选B。
48. The fact has worried many scientists ________ the earth is becoming warmer and warmer these years.
A. what B. which C. that D. though
【答案】C.
【解析】同位语从句。分析句子结构可知，空处引导的是同位语从句，先行词是fact，所以应用在从句中不担当语法成分的that来引导，that引导的从句是对fact(事实，真相)具体内容的解释说明。故选C。
49. A low-carbon (低碳) lifestyle has an effect ________ our daily life. People are paying more and more attention to ________ energies these days.
A. in; save B. in; saving C. on; save D. on; saving
【答案】D.
【解析】固定用法和非谓语动词。have an effect on为固定搭配，意为“对……有影响”;pay attention to意为“注意，重视，留心……”，其中to为介词，其后的动词应用动名词形式。故选D。
50. The secretary worked late into night, ________ a speech for the president.
A. preparing B. to prepare C. prepared D. was preparing
【答案】A.
【解析】非谓语动词。分析句子结构可知，空处应用非谓语动词，作伴随状语。又因work和prepare这两个动作同时发生，且prepare和其逻辑主语The secretary之间为主动关系，所以应用现在分词作伴随状语。故选A。
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