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t believe B. I don39。 I saw the boy fall from the tree. The boy was seen to fall from the tree. (3)介 詞 but前若有 動詞 do的某種形式 ,后面的不定式不 帶 to. The boy did nothing but play. ,we’ll continue our experiment after office hours. necessary necessary necessary 3. Generally speaking, ________according to directions, the drug has no side effect. A. when taking B. when taken C. when to take D. when to be taken Do you think it39。 He likes the songs (that) Zhoujielun sings. He likes the songs (that are) sung by Zhoujielun. 在某些狀語從句中,從句的主語與主句的主語一致時或主語是 it時,可省去 “ 主語 +be”部分 (1) When (he was) still a boy of 10, he had to work day and night. (2) She tried her best tho