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问题: 1、This kind of mistake is very _____ among the stu

1、This kind of mistake is very _____ among the students.是有common吗
2、I ____ in london for many years,but I^ve never regretted my final decision to move back to china.
A lived B had lived 选哪个为什么我选B

解答:

1。common普遍的,常见的
2.A 因为后一句是用的现在时态,所以前面用一般过去时表示相对于现在而言是过去动作,而如果你要选B的话句子应该是i had lived in london for many years before i moved back to china.