this problem has been solved ,it __any moreA needs discussing B needs to be discussed C needn't being discussed D doesn't need discussingneedn't后面不是只能加动词原形吗?

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• this problem has been solved ,it __any moreA needs discussing B needs to be discussed C needn't being discussed D doesn't need discussingneedn't后面不是只能加动词原形吗?
• this problem has been settled ,it __any moreA needs discussing B needs to be discussed C needn't being discussed D doesn't need discussing
• The witness (swear)that what she said was true.(用适当形式）
• once...on another occasion位置Once he landed on the roof of a block of flats and on another occasion,he landed in a deserted car park 这句中 once...on another occasion是一个短语 那on another occasion的位置不是应该在第二句的he前面么 怎么会放在前一句最后呢?什么规律啊