—Look，how happily the boys are swimming in the pool!
—How long ________ they ________?
—For about an hour．
A．have，been swimming B．have，swum
C．do，swim D．have，be swimming
科目：初中英語 來源： 題型：
—Look，how happily the boys are swimming in the pool!
—How long ________ they ________?
—For about an hour．
A．have，been swimming B．have，swum
C．do，swim D．have，be swimming
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