Nowadays(overpopulation)has become a problem we have to face 中become是不是应该用became

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Nowadays(overpopulation)has become a problem we have to face 中become是不是应该用became
Nowadays(overpopulation)has become a problem we have to face 中become是不是应该用became

Nowadays(overpopulation)has become a problem we have to face 中become是不是应该用became
不是,become的过去式为became,过去分词为become.此题中用后者,与has构成现在完成时~