“Recently he has been refusing to do his homework”中文怎么说

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• “Recently he has been refusing to do his homework”中文怎么说
• 1.By the time you get back,great changes___in this area.为什么用问will have taken place?2.On his next birthday he __marries for ten years.用will have been 为什么不用has been?3.john _____now for the light in his room is still on .为什么选must be studying而不选must be studying?4.、I_____tennis quite well,but I have not had time to play since the new year.为什么用play不用played5.——Has sam finished his homework today?——I have on idea .He_____it this morning.为什么选was doing不能选has do
• 请教几道小学英语练习题根据括号内所给词填空.He[ (do)]his homework every evening.He was born on the [ ],nineteen[ ].(10-5-1990)按要求补填句子.（一空一词）1.The twins(twins的中文意思；双胞胎）go to the same school,[ ][ ]?（要求；完成反意疑问句）2．Jim gose to work (by bike).(针对括号内部分提问）；[ ][ ]Jim [ ]to work?3.Mrs.Green usually cooks supper (at six) in the evening.（针对括号内部分提问）；[ ][ ][ ]Mrs.Green[ ]supper in the evening?4.Tom has a radio.(用a colour TV set 改写为选择疑问句);[
• “Recently he has been refusing to do his homework”中文怎么说
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• 已知a,b,c为正实数,且ab+bc+ca=1,证明1/(a^2+1)+1/(b^2+1)+1/(c^2+1)