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【题目】It was some time _________ we realized the importance of protecting the environment.
A.when
B.before
C.since
D.until

【答案】B
【解析】句意:过了一些时间我们才意识到保护环境的重要性。before在……之前。即:在我们意识到保护环境的重要性之前过了一些时间。when当……时候;since自从,前用现在完成时或it is some time。until直到。故选B.

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