這是一個(gè)動(dòng)詞不定式的句型,
IT+BE+形容詞+TO DO.
在這個(gè)句子中,to do,是作真正的主語(yǔ),而IT作形式主語(yǔ),
所以在這個(gè)句子中,to understand是作句子的主語(yǔ).
but it can be very useful to understand中to understand是什么成分?
but it can be very useful to understand中to understand是什么成分?
英語(yǔ)人氣：174 ℃時(shí)間：2020-03-26 19:53:51
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