What terrible weather!The temperature____(change)all the time.请问划线部分是填 is changing 还是 changed.为什么?

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Whatterribleweather!Thetemperature____(change)allthetime.请问划线部分是填ischanging还是changed.为什么?Whatterribl

What terrible weather!The temperature____(change)all the time.请问划线部分是填 is changing 还是 changed.为什么?
What terrible weather!The temperature____(change)all the time.
请问划线部分是填 is changing 还是 changed.为什么?

What terrible weather!The temperature____(change)all the time.请问划线部分是填 is changing 还是 changed.为什么?
is changing.
现在进行时表示常态