We were swimming in the lake ________ suddenly the storm started.


  1. A.
    when
  2. B.
    while
  3. C.
    until
  4. D.
    before
A
解析：
本題意為“我們正在湖里游泳，這時突然刮起了風(fēng)暴。”when引導(dǎo)時間狀語從句時，表示“在……時候”；
也可以引導(dǎo)定語從句，此外還可用做并列連詞，表示“就在這時/那時�！眞hile既可引導(dǎo)時間狀語，也可以做連詞，意為“而，然而”；
until意為“直到……”；
before意為“在……之前�！边@二者都只引導(dǎo)時間狀語。
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