谁能告诉我====动词+ to be doing 和 to doing的区别(下例)比如:software appeared to be making progress (这是文章中的)这个 ...to making progress跟这么写有什么区别啊

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谁能告诉我====动词+ to be doing 和 to doing的区别(下例)比如:software appeared to be making progress (这是文章中的)这个 ...to making progress跟这么写有什么区别啊
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谁能告诉我====动词+ to be doing 和 to doing的区别(下例)比如:software appeared to be making progress (这是文章中的)这个 ...to making progress跟这么写有什么区别啊
谁能告诉我====动词+ to be doing 和 to doing的区别(下例)
比如:software appeared to be making progress (这是文章中的)
这个 ...to making progress跟这么写有什么区别啊

谁能告诉我====动词+ to be doing 和 to doing的区别(下例)比如:software appeared to be making progress (这是文章中的)这个 ...to making progress跟这么写有什么区别啊
appeared to be 是固定搭配 意思是 “看起来是...”

to be doing 的to 是动词不定式符号
to making progress的to 是介词