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he is()doing his homework速求! It must be Jim's,_____?A.mustn't it B.needn't it C.isn't it D.be not it You needn't be so rude about it.这句话中about是什么意思 He is j___ doing his homework you needn't do it now改为被动语态是it mustn't be done by you now吗 He is b_____ doing his homework When did your father____Shanghai?A.arrive at B.get to C.reach to D.arrive in说一下它们的区别 When did you arrive in Shanghai?_____9:30_____ the morning of April 4th.A.At; onB.At; inC.In;atD.On;at When did you arrive in Shanghai?--- It was five____ i arrived there/A.when B.that C.whichD.at which when did he ____?A.arrive B.arrive in C.arrive at D.get I _ don't know what it is I don't know what is it 和 I don't know what it is RT,意思是我不知道这是什么 有i needn't it 的说法吗既然直接用 't ,那不就代表是情态动词吗?那后面就应该加动词 而不是名词,所以请问有没有这种说法 还是用 i don't it? 请帮我回答3个自然科学的问题.（测量影子长度）如何利用影子测量高度?生活中有哪些这样例子?同一物体在同一地点的不同时间的影子长短如何?相同长度的物体同一时间在不同纬度的地区 what nationality is __ ————(him、his、 he)?选择哪个?为什么? "What is his nationality?"的中文意思 what is his nationality 后面如何回答? what is your nationality?what nationality are you?这两句用is或are是由助动词后的词决定的 what color is your favorite?what colors are your favorite?那么为什么这两句用is或are是由助动词前的词决定的呢? He is doing his homework,in the mean time,he is listening music.这句话这样翻译对吗. Don't be afraid of the dark.I'll stay with you.同义句Don't be afraid of the dark.I'll stay with you.(同义句)Don't ___ ___ ___ the dark.I'll stay with you. you needn't worry about it. 同义句.you _______________________ worry about it.说明原因. what is his favorite subject/?为什么要用his啊?不用he或者him Do you know what（ A his favorite song is B his favorite song _______you have breakfast every morning?yes,_______course.what about you?sometimes i sleep too long ,i get up very late.i have_________time to have breakfast._________you feel tirend and hungry if you don't have breakfast?yes,i______.______the way .w But this color is very He is doing his homework now.Don't b___him 请问什么叫做纯色?pure color 为什么氢会在空气中燃烧?这和太阳中氢的燃烧有什么区别? 氢在空气中燃烧,释放热量的是氢质子还是氢电子, 含有氢元素的物质在空气中燃烧一定会生成水吗 一群人去野营,一个帐篷住5个人,但却要多出15个人,但住6个人却刚刚好,那要多少个帐 个位英语大师,可以告诉我 Can you tell me ( ) is the way ( ) the zoo. 怎么填?汉语是：你能告诉我去公园怎么走吗?在请告诉我：live的现在分词是什么?speak的过去式是什么?