题目内容

10. The light was on just        and then went out.

   A. at a time   B. for a time

   C. at one time   D. for the time being

10. B for a time意为"一会儿",相当于for a while/for a moment0 at a time意为"每次";at one time意为"曾经,一度";for the time being 意为"暂时,眼下"。

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