can和could都是情态动词
选C.watch一般是观看,看电视什么的,或是注视,看守,look就是一般的看...
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Are you our/ mynew music teacher?...
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A is an important part of B....
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Is he tall?
Yes,he is.
No,he isn't.
手机提问的朋友在客户端右上角评价点【满意】即可....
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forty eight 应该写作:forty-eight
个位数和十位数之间要加连字符....
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