[题目]Since the time humankind started gardening, we to make our environment more beautiful.A.tryB.have been tryingC.are tryingD.will try 题目和参考答案——青夏教育精英家教网—

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【题目】Since the time humankind started gardening, we _____to make our environment more beautiful.
A.try
B.have been trying
C.are trying
D.will try

【答案】B
【解析】句意：自从人类开始园艺，我们一直尽力使我们的环境更美丽。since 作为介词,后接某一确定的时间点,主句谓语动词是持续性动词,常与现在完成时态、现在完成进行时态或过去完成时态连用。故B正确。

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