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 Thewater      darkanddirty.It’snolongersafetodrink.A.b...

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 Thewater      darkanddirty.It’snolongersafetodrink.A.b...

 The water       dark and dirty. It’s no longer safe to drink.

A. became     B. has become   C. will become   D. was becoming

【回答】

B

知識點:動詞時態

題型:選擇題