we shouldn't cross the street when the light _____ red .是用is 还是changes.请说明理由.

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we shouldn't cross the street when the light _____ red .是用is 还是changes.请说明理由.
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we shouldn't cross the street when the light _____ red .是用is 还是changes.请说明理由.
we shouldn't cross the street when the light _____ red .是用is 还是changes.请说明理由.

we shouldn't cross the street when the light _____ red .是用is 还是changes.请说明理由.
是用is
change sth,意思是改变什么,如果要说到变成----的话,需要用change to/into,需要加个介词.显然句子的意思不是改变红色,应该是变成红灯的时候,所以应该有to/into,才能用change.
所以只能选is了,灯是红色的时候,也就是当红灯的时候~

用turns

is 表示一种状态

we shouldn't cross the street when the light is red .
we shouldn't cross the street when the light changes to red .
所以是 "is"。

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