------Tom is very good at science,his brother is hopeless A

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------Tom is very good at science,his brother is hopeless A While B When C If DBecause

while Tom is very good at science,his brother is hopeless 他哥哥（对科学）没有一点希望,而Tom却很擅长.
=his brother is hopeless while Tom is very good at science(while 表示转折）又如
He is tall while his brother is short

------Tom is very good at science,his brother is hopeless A 把Tom is very good at English,his sister is very good at Engl Tom is at handwriting very much .A .good B Tom is very wild,but his brother is quite c___ Tom is a little_____than his brother.(tall) _(me)see a panda in the picture._(his)is good at science.Ple He is a good boy,and his brother is ( )good. Tom's brother is good at m_______ dance. Tom is ____ (擅长）at English than his brother. Tom is b_______ his little brother at home. 英语翻译Tom is a basketball fan and he is very good at playing i My brother is good at his study.改同意句