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1、Albert Einstein traveled to the main cities of Italy,_____

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1、Albert Einstein traveled to the main cities of Italy,______ he came back with some ideas.
A.which B.there C.where D.that
2、He has not quite solved the problem yet,but he is ________ it.
A.making of B.working on C.clearing up D.trying out
1.C where.这儿where he came back with some ideas是一个非限制性定语从句,where指代的是前文提到的the main cities of Italy.
2.B 原句的意思是:虽然他还没有解决这个难题,但是他正在解决这个难题.
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