The time _________ I first spend with Nelson Mandela was a very difficult period of my life.
A． whenB． whichC． of whichD． at which
B

試題分析：句意：我第一次和曼德拉度過的時光是我生命中非常困難的一段時期。這個句子包含一個定語從句，且關(guān)系詞在從句中作賓語，指物，故用關(guān)系代詞 which，選B。
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