_—Did you visit the Summer Palace?—No.We could have, we spent too much time shopping.A.so

发布时间：2020-08-17 14:41:37

_—Did you visit the Summer Palace?
—No.We could have,     we spent too much time shopping.
A.so        B but             C.ecause    D.though

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解析：考查连词。but表示转折意义，符合语境。
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