He came back on and left on .
A. a Wednesday, the Saturday
B. the Wednesday, a Saturday
C. The Wednesday, the Saturday
D. a Wednesday, a Saturday
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(答案→)A. a Wednesday, the Saturday
B. the Wednesday, a Saturday
C. The Wednesday, the Saturday
D. a Wednesday, a Saturday
解析：句意为：他在一个周三回来了，又在那个周六离开了.故选A项.