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英语问题(需要讲解)He wrote a _____letter to his parents.A five-hundr

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英语问题(需要讲解)
He wrote a _____letter to his parents.A five-hundred-words B five-hundreds-words
C five-hundred-word Dfive-hundreds-word为什么选C
是不是现这种有连词符号的都用单数形式啊?
In the past three years,he ____very hard at math and English A works B worked C has worked D is working
She asked me ____the bike without any help this morning.
A how does he mend B how he mended C how he mend D how did he mend这道题为什么选B?
1 可以这说说,数字与名词组成的复合形容词用‘-’连接,名词不能加S,只有C对.
2 C 根据in the past three years 在过去的三年‘ 是现在完成时的标志.
3 宾语从句是陈述语序,排除A D ,主句是一般过去时(asked) ,从句要用相应的过去时,再排除C ,只有B对.