__________ 查看材料A.everB.NeverC.BeforeD.once请帮忙给出正确答
__________ 查看材料
A.ever
B.Never
C.Before
D.once
请帮忙给出正确答案和分析,谢谢!
参考解答
正确答案:D
once“曾经”;ever,never一般用在完成时中;before一般放在句末。因此选D。
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