答案:B
解析:
The error in this sentence occurs at (B), where there is an inappropriate verb form. To match the past tense established and used elsewhere in the sentence ("Once," "replaced"), the past-tense "became" is needed.
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答案:B
解析:
The error in this sentence occurs at (B), where there is an inappropriate verb form. To match the past tense established and used elsewhere in the sentence ("Once," "replaced"), the past-tense "became" is needed.