He_______just before the concert started.
A．dropped outB．dropped awayC．dropped inD．dropped up
A
短語辨析。Drop out退學(xué)，脫離；drop away離開，逐漸減少；drop  in 落入，逐漸進入；drop up不期來到。句意：就在音樂會開始前他退出了。故選A。
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