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A
after
B
before
C
until
D
but
正确答案 :B
解析
本题考查介词词义辨析。
句意:简,离开教室前请把灯关掉。B项:before“在……之前”。故B项符合题意。
A、C、D项为干扰选项,故排除。
故本题答案为B。
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