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    精英家教网 > 高中英语 > 题目详情
    Since the time humankind started gardening, we _____to make our environment more beautiful.
    A．tryB．have been trying
    C．are tryingD．will try
    B

    试题分析：考查动词时态。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。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。故B正确。
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