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月球的昼半球能看到蔚蓝的天吗 it is difficult to do /doingit is difficult 后接to do 还是doing 月球是不是空的最近对月亮很感兴趣 再问下make it difficult 后面接to do 还是in doing 为什么 Have Difficult to do something与Have Difficult doing something的区别 It's good for you to keep_____when something difficult needs___.A trying;to do B trying;doingC to try;to doD to try;to be done 美国在月球上发现了什么 飞机上能看见月亮吗?坐在飞机上能看见月亮和太阳吗! 请问12生肖中有不睡觉的动物吗? 12生肖什么动物是跪着睡的 有没有伤感一些的古诗词? 12生肖什么是站立会睡觉动物 insist in doing sth.和insist on doing sth.和insist on sth.的区别,每种情况都举例和列举与其他情况的不同之处 keep up doing 和insist on doing有什么区别 insist to do还是insist doing来着? insist on ,stick to (doing),keep at,keep doing sth,keep on doing keep to do sth.go on doing goinsist on ,stick to (doing),keep at,keep doing sth,keep on doing,keep to do sth.go on doing,go on to do,go on with ,有什么区别 有insist doing sth.这种结构的吗?还是说只能用insist on doing sth.的结构?就是说一定要用到介词on? 面积单位进率是多少面积单位进率说的越多越好!shuo zhun que 面积单位之间的进率是多少 英语翻译2006考研英语text2第二段最后一句话：It's all deliciously ironic when you consider that Shakespeare,who earns their living,was himself an actor (with a beard) and did his share of noise-making. Y十二生肖中哪个短命的动物 短命是十二生肖什么动物 12生肖短命的动物是?蛇羊鸡兔子,哪只短命? 求面积单位和进率 下午的六级作文题是什么,猜得最准的给100分 用3个比较级造句和3个最高级造句（英语） Tom总是在公交车上把他的位置让给老人（翻译成英语） 飞机的主要构成部件由什么组成, 小学阶段学习的面积单位之间的进率是多少 面积单位之间的进率不是课件和试卷, easy比较级和最高级 easy的比较级是?最高级是?