2. 专升本
  3. Since the time humankind started gardening, we______to make our environment more beautiful.

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

admin2017-03-21  45
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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