They have taken measures to solve the city’s pollution problem, but it may be so

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问题 They have taken measures to solve the city’s pollution problem, but it may be some time ______the situation improves.

选项 A、before
B、for
C、unless
D、since

答案 A

解析他们已采取措施解决城市污染问题，但要使情况好转，还需要一段时间。It may／will be some time before…意为“要…还需要等一段时间”。

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