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2. 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

2.    B考查动词的时态。句雾:自人类开始园艺的时期起,我们就一直努力把我们的环境变得更加美好。根据since的提示可知用现在完成时,再根据语境可知,动作try从过去一直持续到现在,而且还要继续进行下去,因此用现在完成进行时。

题目来源:2015全品语法快练高中英语新课标 > 训练15 动词的时(语)态和主谓一致

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