Not only his relatives but also he _____ to Canada. They all think it is a beautiful country._刷题宝

题干

Not only his relatives but also he _____ to Canada. They all think it is a beautiful country.

A：goes

B：go

C：have been

D：has been

上一题下一题 0.0难度选择题更新时间:2017-03-20 02:55:20

答案(点此获取答案解析）

D

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⑤硬脂酸钠

⑥牛油．

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用限制酶切割一个DNA分子，获得一个目的基因时，形成的粘性末端有

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