Scientists have ____ that motion is the source of life

Scientists have ____ that motion is the source of life
a、shown
b、showed
c、been shown
d、showing

1516521 1年前已收到3个回答举报

阿家西幼苗

共回答了24个问题采纳率：91.7% 举报

选A
意思是：表明
have done完成时

1年前

云牵鬼幼苗

共回答了16个问题举报

答案是A：
科学家们已经指出：生命在于运动。
have done 表示已经完成的动作，b项动词形式错误，c项的被动不合题意。

1年前

gogoanyoung 果实

共回答了13288个问题举报

1年前

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