we walk( )the park and have our picnic ( )a big tree .选项:a .through,under b.through ,in c.across ,under

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we walk( )the park and have our picnic ( )a big tree .
选项:a .through,under b.through ,in c.across ,under

A
through是从中间穿过
across是从表面穿过
under the tree 是在树下
in then tree 是在树上