The 12 million people in Mexico City woke up on September 19th, 1985, to find their city ______ after the terrible quake.
A.in trouble
B.in ruins
C.out of work
D.at midnight
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B解析本题考查介词短语辨析。句意:1985年9月19日1千2百万人在墨西哥市醒来后在可怕的地震过后发现他们的城市已成为废墟,in ruins成为废墟。