解答

✨ 最佳解答 ✨

1.heard是感官動詞,感官動詞的(被動)可用不定詞to+V或Ving

如:He was heard singing/to sing…

2.made是使役動詞,使役動詞的(被動)只用不定詞to+V

He was made to show…

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