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ch, feel等后接省略to 的不定式作賓語補(bǔ)足語的主動語態(tài)變?yōu)楸粍诱Z態(tài)時,動詞不定式的符號 to 還要 加上去。如: The boss made them work for 16 hours a day. → They were made to work for 16 hours a day (by the boss). We saw them work in that workshop. → They were seen to work (by us) in that w