The sky is much bluer _ we have taken ac...[九年级][地理]
收录时间：2021-11-01 答题：初三地理（吉老师）
【题目】The sky is much bluer ________ we have taken action to protect the environment.
A.because B.before C.until D.unless
【答案】A
【解析】
句意：天空更蓝了，因为我们已经采取行动保护环境。A. because因为；B. before在……之前；C. until直到；D. unless除非。根据下文we have taken action to protect the environment.可知这里是表示原因。根据题意，故选A。
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