At least 76 people died when a Sibir Airlines Tu-154 ________ into the sea about 180k

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At least 76 people died when a Sibir Airlines Tu-154 ________ into the sea about 180kilometers from the Russian resort of Sochi on Thursday.

A. dropped

B. jumped

C. plunged

D. declined

热搜:a是b的充分条件,b是a的必要条件吗