LOOK,an aeropiane < >over the river 1;fiy 2; isfiying 3; flies 4;flew

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LOOK,an aeropiane < >over the river 1;fiy 2; isfiying 3; flies 4;flew

LOOK,an aeropiane < >over the river 1;fiy 2; isfiying 3; flies 4;flew
LOOK,an aeropiane < >over the river 1;fiy 2; isfiying 3; flies 4;flew

LOOK,an aeropiane < >over the river 1;fiy 2; isfiying 3; flies 4;flew
是3,flies
像fly,come这样的非持续行动词,现在分词ing表示将要发生的动作.Eg,the bus is coming.(公交车要到了.)
所以应该用一般现在时,flies,飞过.还有是aeroplane,不是i.

2.现在进行时。从Look可以知道是现在的时间,用进行时

肯定选2,表示正在从河上飞过

is flying
看,一辆飞机正飞过河流。