My mother is_reading_a letter from her friend.是为什么?
人气：290 ℃ 时间：2019-08-17 09:16:57
解答
为什么用reading?
助动词用的是is,be动词后面要跟动词的进行时状态,所以read要用reading.
我母亲正在读她朋友的来信.
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