词性转换The paint on the fence ____ (come) off as the result of exposure to the rain for a long time.

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词性转换The paint on the fence ____ (come) off as the result of exposure to the rain for a long time.
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词性转换The paint on the fence ____ (come) off as the result of exposure to the rain for a long time.
词性转换
The paint on the fence ____ (come) off as the result of exposure to the rain for a long time.

词性转换The paint on the fence ____ (come) off as the result of exposure to the rain for a long time.
_________as________
在as 的前面最好用“has” or "have"
所以这个问题的答案是 has come
paint是不可数的 用has
come的过去分词还是come
答案也可以是“come“,因为come是过去分词,去掉has也可以(这比较口语化)
为何不用had(过去式)呢?句子之中并未给出明确的时间