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First _______ for homeschoolers, the self-taught learning tutorials are extremely popular.
(A) developing
(B) to develop
(C)develop
(D) developed

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難度： 困難

	1F 林寶寶 (2013/05/12) 是被動嗎? 還原的句子是甚麼? 檢舉
	2F 高振剛國二下 (2013/05/12) 原句為When the self-taught learning tutorials are first developed for homeschoolers, they are extremely popular. （一開始為在家自學者而設計，自修教學即非常受到歡迎。）分詞構句後，相同主詞self-taught learning tutorials省略，are變成分詞being省略，連接詞when亦可省略檢舉

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