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(  )10.Tom_____in the library every night over the last three months.

A.Works

B.worked

C.has been working

D.had been working

10.C【解析】句意:在过去的三个月里Tom每天晚上都在图书馆工作。根据over the last three months可知强调在过去时间段一直从事某件事,优先选择现在完成进行时。故选C。

(  )11.The number of smokers,_____is reported,has dropped by 17 percent in just one year.

A.a

B.which

C.what

D.as

11.D【解析】句意:正如所报道的那样,吸烟者的数量仅一年就减少了17%。这是含有非限制性定语从句的复合句,空缺的词为关系代词,故排除A、C。as引导的非限制性定语从句位置灵活,可以放在句首、句中、句末。这里的关系代词指代的是“the number of smokers has dropped by 17% in just one year”这一整句,且as is reported是常用表达法。故选D。

(  )12._____more about Chinese culture,Jack has decided to take Chinese folk music as an elective course.

A.Learn

B.Learned

C.To learn

D.To be learning

12.C【解析】Jack与learn之间为逻辑上的主动关系,且表示目的,故用不定式作目的状语。句意:为了更多地了解中国文化,杰克已经决定把中国民间音乐作为选修课程。

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