[考題] 連接詞

[suspect1 ()]

考題：高中


題目：
 _______  she got to the airport , all of the other passengers had already
 boarded .

 (a)By the time
 (b)Once
 (c)After
 (d)Until

 Answer:(a)

提問：
  (b)(c)(d)為何不行？


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