Our school basketball match will be held from October 12th to 16th, during time as many as 30 teams will pete for the championship.
A. which
B. whose
C. when
D. that
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(答案→)A. which
B. whose
C. when
D. that
解析：句意：我们学校的篮球比赛将在10月12日—16日举行，在这期间多达30队将争夺冠军。这里是定语从句，先行词是时间，所以介词之后应该用关系代词， that不能用在介词之后，故选A。