it is sunday ___ we often go fishinga.when b.in which

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it is sunday ___ we often go fishinga.when b.in which
it is sunday ___ we often go fishing
a.when b.in which

it is sunday ___ we often go fishinga.when b.in which
when
要的话也是on which

A

A

when. 关系副词等于介词加关系代词.when=on which. 因为星期前要用on.

A