【分析解答题】Thomas (invented) the record player in 1877 while (engaged research) on (the) telegraph at (his laboratory) in New Jersey.
网考网解析:
试题答案:engaged research------(he was) engaged in the research。while是连词,后面接整个句子。而且engage是“使从事于”的意思。因此要用sb be engaged in sth.这种形式。另外,he was 作为从句的主系结构可以同时省略 答案解析:暂无解析
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