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第1题

He said that he ___ to the United States. ( )(本题2.5分) A、 had never gone B、 had never been C、 has never been
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第2题

The railway ____ in three years. ( )(本题2.5分) A、 has completed B、 is complete C、 will be completed D、 wil
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第3题

5. 根据着丝粒位置和染色体大小,将人类22对常染色体由大到小依次命名为1至22号,并将人类染色体分为7组,其中属于D组的染色体是( )(本题2.0分) A. 5~12号染色体 B. 6~13号染色体 C. 13~15号染色
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第4题

They _________ on the program for almost one week before I joined them, and now we ___ on it as no good results have com
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