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You can hardly imagine the once clear canal so seriously polluted that no fish c

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You can hardly imagine the once clear canal so seriously polluted that no fish c

You can hardly imagine the once clear canal _____ so seriously polluted that no fish can live in it.

A. have become　 B. having become　 C. to have become　 D. to become

 

试题答案

B

标签：clearoncecanalseriouslyso

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