答案:C
解析:
The error in this sentence occurs at (C). The participle "switching" cannot function as the main verb of the sentence and should be replaced by the present tense verb phrase "are switching."
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答案:C
解析:
The error in this sentence occurs at (C). The participle "switching" cannot function as the main verb of the sentence and should be replaced by the present tense verb phrase "are switching."