Since the time humankind started gardening, we______to make our environment more beautiful.

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问题 Since the time humankind started gardening, we______to make our environment more beautiful.

选项 A、try
B、have been trying
C、are trying
D、will try

答案B

解析 考查动词时态。根据时间状语“Since the time humankind…”可知“我们努力让环境更美”的行为从过去一直持续到现在,用现在完成进行时。
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