Once ___, it can never be forgotten.A．seeB．to be seenC．seenD．saw
题型：不详难度：来源：
Once ___, it can never be forgotten.| A．see | B．to be seen | C．seen | D．saw |
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答案
| C |
解析
| seen是过去分词,它用作时间状语时,常与once, when, whenever, while,until一起用. |
举一反三
He did the right thing ___ for some fresh air even in cold winter.| A．to keep the chidlren from going out | B．to prevent the childern from going out | | C．to keep the children going out | D．to prevent the children going out |
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“Do you mind ___? ” “Go ahead.”| A．closing the window | B．your closing the window | C．my closing the window | D．I closing the window |
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I’ll get my secretary ___ the letter.| A．copy | B．to copy | C．copies | D．copied |
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