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In the abstract, it says "[...] but things have became more difficult with the introduction [...]".
The present perfect form is have become, while the past form is simply became. AFAIK have became is incorrect.
The text was updated successfully, but these errors were encountered:
In the abstract, it says "[...] but things have became more difficult with the introduction [...]".
The present perfect form is have become, while the past form is simply became. AFAIK have became is incorrect.
The text was updated successfully, but these errors were encountered: