【題目】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:過了一些時(shí)間我們才意識(shí)到保護(hù)環(huán)境的重要性。before在……之前。即:在我們意識(shí)到保護(hù)環(huán)境的重要性之前過了一些時(shí)間。when當(dāng)……時(shí)候;since自從,前用現(xiàn)在完成時(shí)或it is some time。until直到。故選B.

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