Although apes have a remarkable memory that enables them to master hundreds of visual signs, there is no evidence yet of understanding syntax. A. there is no evidence yet of understanding syntax B. there is yet no evidence of their having understood syntax C. there is as yet no evidence that they understand syntax D. as yet they dont understand syntax in light of the evidence E. yet they have no understanding of syntax, according to the evidence 想问一下C 有as yet这种用法吗 这是甚麽意思啊 B是哪里错误 答案是C --

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