______ you transfer your account, sign on the dotted line.

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问题 ______ you transfer your account, sign on the dotted line.

选项 A、While
B、Because
C、During
D、Before

答案D

解析 Before indicates a sequential time relationship. Choice (A) indicates a simultaneous time relationship. Choice (B) indicates cause and effect. Choice (C) indicates a simultaneous time relationship but is not followed by a subject and verb.  
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