Do you know the speed ________ which a rocket travel？


  1. A.
    in
  2. B.
    at
  3. C.
    on
  4. D.
    with
B
解析：
表示“以……速度”時(shí)，需用介詞at。此句中speed是先行詞，被“介詞+關(guān)系代詞”引導(dǎo)的定語(yǔ)從句所修飾。故B為正確答案。
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