题目内容
9.Since the time human beings started gardening,we ________ to make our environment more beautiful.( )A. | will try | B. | would be trying | ||
C. | are trying | D. | have been trying |
分析 自从人类开始园艺,我们一直尽力使我们的环境更美丽.
解答 答案:D.
考查动词时态.since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、现在完成进行时态连用;故选D.
点评 本题考查现在完成进行时,表示从过去某个时间点开始的动作,一直持续到现在,还可能继续下去.做题时,重点体现一种强烈的情感.

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