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Where is John?He____ to the library and he______ there for a

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Where is John?He____ to the library and he______ there for an hour
A.has been,has been B.has gone,has been
C.goes ,went D.has been,will be
Where is John?He____ to the library and he______ there for a
B 他已经去了图书馆并已呆了两个小时.has gone表示去了还没回来 has been表示去了已经回来了 另外 has been是延续性的,可与时间段连用 即for an hou