---Whatoneartharethepolicebusywith?  ---Theyhavebeenloo...

問題詳情：

---What on earth are the police busy with?

   ---They have been looking into how the plane crash _______.

  A. came out     B. came up      C. came down      D. came about

【回答】

D

知識點：動詞

題型：選擇題