【題目】I ______the paper before my lawyer explained the details to me.

A. signed B. had signed

C. signs D. has signed

【答案】B

【解析】

試題分析：考查過去完成時(shí)。句意：在我的律師和我詳細(xì)說明之前我就已經(jīng)簽字了。由題中時(shí)間點(diǎn)可知是過去完成時(shí)，故選B。

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