Unit 4 An old man tried to move the mountain.I. 单项选择。1I _ my homework as soon as I got home last night Ado Bdid Cwill do Dam doing2Miss Gao asked a question,but it was _ that nobody could answer it Avery difficult Btoo difficult Cdifficult enough Dso difficult3 Smoking is bad for your health Youre rightI decide to _ Atake it down Bfind it out Cturn it off Dgive it up4Cao Wenxuans new book has just _
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