在“There are a lot of difficulties facing us"中,动词ing作什么成分
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在“There are a lot of difficulties facing us"中,动词ing作什么成分
在“There are a lot of difficulties facing us"中,动词ing作什么成分
在“There are a lot of difficulties facing us"中,动词ing作什么成分
修饰difficulties 意思是我们面临的困难
there be doing
现在分词引导状语