作业帮It's twenty years that we (became) friends是用became还是have been
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It's twenty years that we (became) friends是用became还是have been
用Have been表示一种状态.
而用became时,就可以这么用.
Twenty years ago .we became friends.
have been
用have been 因为我们成为朋友已经20年了，这表达的是一个很长时间段的情况，从我们成为朋友到现在20年了。要用现在完成时，指从过去到现在。如果用became只是强调过去，不表达现在的情况。如要表达“20年前，我们成为朋友的”，可以用 We became friends twenty years ago....
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用have been 因为我们成为朋友已经20年了，这表达的是一个很长时间段的情况，从我们成为朋友到现在20年了。要用现在完成时，指从过去到现在。如果用became只是强调过去，不表达现在的情况。如要表达“20年前，我们成为朋友的”，可以用 We became friends twenty years ago.
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用have been 是现在完成时
It's twenty years that we (became) friends是用became还是have been
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