问题描述：
为什么不用that和when
—How did she find the trip to Beijing last month?
—She enjoyed herself so much（）she visited the Great Wall.
A.where B.when C.thatD.until
—How did she find the trip to Beijing last month?
—She enjoyed herself so much（）she visited the Great Wall.
A.where B.when C.thatD.until
问题解答：
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