The bus dropped me off and pulled away I realized I had left my bag on it.A. while B. beforeC. after

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【题目】The bus dropped me off and pulled away _____I realized I had left my bag on it.

A. while B. before

C. after D. since

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【答案】B

【解析】

考查连词辨析。句意：在我意识到我包落在车上前，这辆公共汽车已经开走了。文中表示“在我意识到以前”，A. while虽然；B. before在…之前；C. after在…之后；D. since自从，故选B。