One of the aims of the organization is to develop and encourage recycling practi

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问题 One of the aims of the organization is to develop and encourage recycling practices that are______economically viable and environmentally sound.

选项 A、both
B、if so
C、as
D、not only

答案 A

解析语法：连词固定搭配1．空格后出现连词and，很自然联想到both A andB，因此(A)both为正确选项。2．注意以下固定搭配：both A and B，neither A norB，not only A but also B。

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